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Laser-Induced Quench Study of the Magneto-Thermal Stability of Nb3 Sn Wires
Joanna Helena Kuczynska, S. C. Hopkins, Carmine Senatore and T. Boutboul

IEEE transactions on applied superconductivity 35 5, 6000306, 1-6 (2025)

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Pressure-tuned many-body phases through Γ-K valleytronics in moiré bilayer WSe2
Marta Brzezińska, Sergii Grytsiuk, Malte Rösner, Marco Gibertini and Louk Rademaker

2D materials 12 1, 015003 (2025)

Recent experiments in twisted bilayer transition-metal dichalcogenides have revealed a variety of strongly correlated phenomena. To theoretically explore their origin, we combine here ab initio calculations with correlated model approaches to describe and study many-body effects in twisted bilayer…

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Superconductivity in metallic hydrogen
Dirk Van Der Marel and Christophe Berthod

Newton 1 1, 100002 (2025)

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From weak- to strong-coupling superconductivity in the AlB2 -type solid solution SrGa1−xAlx Ge with honeycomb layers
Dorota Iwona Walicka, Olivier Blacque, Tomasz Klimczuk and Fabian von Rohr

Journal of physics. Condensed matter 37 4, 045704 (2025)

We report on the structure and the superconducting properties of 9-electron 111 compounds with honeycomb layers, namely SrGaGe, SrAlGe, and the SrGa1-xAl x Ge solid solution. By means of single-crystal x-ray diffraction we show that, on one hand, SrGaGe crystallizes into the…

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Efficient soft-chemical synthesis of large van-der-Waals crystals of the room-temperature ferromagnet 1T-CrTe2
Kai Roeseler, Catherine Witteveen, Céline Besnard, Vladimir Pomjakushin, Harald O Jeschke and Fabian von Rohr

Journal of materials chemistry. A (2025)

We herein report on a fast and convenient soft-chemical synthesis approach towards large 1T-CrTe2 van-der-Waals crystals. This compound is formed X-ray diffraction pure, with a complete conversion within just over 2 h from flux-grown LiCrTe2 crystals using diluted acids. Due…

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Doping Tunable CDW Phase Transition in Bulk 1T-ZrSe2
Andreas Ørsted, Alessandro Scarfato, Céline Barreteau, Enrico Giannini and Christoph Renner

Nano letters 25, acs.nanolett.4c06377, 1729-1735 (2025)

Tunable electronic properties in transition metal dichalcogenides (TMDs) are essential to further their use in device applications. Here, we present a comprehensive scanning tunneling microscopy and spectroscopy study of a doping-induced charge density wave (CDW) in semiconducting bulk…

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Structural Modulation and Enhanced Magnetic Ordering in Incommensurate K1–x CrSe2 Crystals
Félix Eder, Catherine Witteveen, Enrico Giannini and Fabian von Rohr

Journal of the American Chemical Society, 4c13545 (2025)

Layered delafossite-type compounds and related transition metal dichalcogenides, characterized by their triangular net structures, serve as prototypical systems for exploring the intricate interplay between crystal structure and magnetic behavior. Herein, we report on the discovery of the compound…

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X-Ray Absorption Spectroscopy to investigate precipitated oxides in Nb 3 Sn wires with an internal oxygen source
Gianmarco Bovone, Florin Buta, Francesco Lonardo, Marco Bonura, C. N. Borca, T. Huthwelker, S.c. Hopkins, A. Ballarino, T. Boutboul and Carmine Senatore

IEEE transactions on applied superconductivity 34 3, 6000205 (2024)

Internal oxidation can achieve significantly enhanced Jc in Nb 3 Sn wires, but the mechanism of oxygen transport and oxide precipitation is not fully understood. Our investigation employs X-ray Absorption Near-Edge Structure (XANES) spectroscopy, revealing insights into the…

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Estimation of Physical and Electrical Properties of Various REBCO Tapes for Construction of Very-High-Field REBCO Magnet
Jung-Bin Song, Xavier Chaud, François Debray, Kévin Paillot, Philippe Fazilleau, Thibault Lécrevisse, Thomas Herrmannsdörfer, Carmine Senatore, Marc Dhallé and Anis Smara

IEEE transactions on applied superconductivity 34 5 (2024)

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Assessing the Ubiquity of Bloch Domain Walls in Ferroelectric Lead Titanate Superlattices
Edoardo Zatterin, Petr Ondrejkovic, Louis Bastogne, Céline Lichtensteiger, Ludovica Tovaglieri, Daniel A. Chaney, Alireza Sasani, Tobias Schülli, Alexei Bosak, Steven Leake, Pavlo Zubko, Philippe Ghosez, Jirka Hlinka, Jean-Marc Triscone and Marios Hadjimichael

Physical review. X 14 4, 041052 (2024)

The observation of unexpected polarization textures such as vortices, skyrmions, and merons in various oxide heterostructures has challenged the widely accepted picture of ferroelectric domain walls as being Ising-like. Bloch components in the 180° domain walls of PbTiO 3 have recently been…

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Critical current degradation of commercial REBCO coated conductors under thermomechanical loads
Celia Lucas Esparseil, Pablo Cayado Llosa, Hannes Rijckaert, Konstantina Konstantopoulou, Davide Nardelli and Carmine Senatore

Superconductor science and technology 37 12, 125014 (2024)

The process to obtain a superconducting joint between Coated Conductors (CCs) involves the simultaneous application of temperature and transverse compressive pressure to promote the joining of the two adjacent RE BCO layers. We performed experiments to simulate this procedure by subjecting samples…

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Behavior of Water Adsorbates on Ferroelectric Thin Films
Loïc Musy

Thèse, 149 (2024)

Cette thèse explore, à l’aide de la microscopie à force atomique (AFM), le comportement des charges de surface sur les ferroélectriques, et la manière dont l’eau réagit selon l’orientation de la polarisation. En complément des techniques AFM, des développements matériels (contrôleur…

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Ductile-to-brittle transition and yielding in soft amorphous materials: perspectives and open questions
Thibaut Divoux, Elisabeth Agoritsas, Stefano Aime, Catherine Barentin, Jean-Louis Barrat, Roberto Benzi, Ludovic Berthier, Dapeng Bi, Giulio Biroli, Daniel Bonn, Philippe Bourrianne, Mehdi Bouzid, Emanuela Del Gado, Hélène Delanoë-Ayari, Kasra Farain, Suzanne Fielding, Matthias Fuchs, Jasper van der Gucht, Silke Henkes, Maziyar Jalaal, Yogesh M Joshi, Anaël Lemaître, Robert L Leheny, Sébastien Manneville, Kirsten Martens, Wilson C K Poon, Marko Popović, Itamar Procaccia, Laurence Ramos, James A Richards, Simon Rogers, Saverio Rossi, Mauro Sbragaglia, Gilles Tarjus, Federico Toschi, Véronique Trappe, Jan Vermant, Matthieu Wyart, Francesco Zamponi and Davoud Zare

Soft matter 20 35, 6868-6888 (2024)

Soft amorphous materials are viscoelastic solids ubiquitously found around us, from clays and cementitious pastes to emulsions and physical gels encountered in food or biomedical engineering. Under an external deformation, these materials undergo a noteworthy transition from a solid to a liquid…

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Moiré magnetism in CrBr3 multilayers emerging from differential strain
Fengrui Yao, Dario Rossi, Ivo Antoniev Gabrovski, Volodymyr Multian, Nelson Hua, Kenji Watanabe, Takashi Taniguchi, Marco Gibertini, Ignacio Gutierrez Lezama, Louk Rademaker and Alberto Morpurgo

Nature communications 15 1, 10377 (2024)

Interfaces between twisted 2D materials host a wealth of physical phenomena originating from the long-scale periodicity associated with the resulting moiré structure. Besides twisting, an alternative route to create structures with comparably long-or even longer-periodicities is inducing a…

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Topological superconductivity with mixed singlet-triplet pairing in moiré transition metal dichalcogenide bilayers
Waseem Akbar, Andrzej Biborski, Louk Rademaker and Michał Zegrodnik

Physical review. B 110 6, 064516 (2024)

We investigate strong coupling topological superconductivity in twisted moiré bilayer WSe2. Our approach is based on an effective t-J model with displacement-field-dependent complex hoppings, which is treated with the variational Gutzwiller projection method. The calculated phase diagram contains …

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Hall response of locally correlated two-dimensional electrons at low density
Giacomo Arturo Maria Morpurgo, Louk Rademaker, Christophe Berthod and Thierry Giamarchi

Physical review research 6 1, 013112 (2024)

We study the Hall constant in a homogeneous two-dimensional fluid of correlated electrons immersed in a perpendicular magnetic field, with special focus on the regime of low carrier density. The model consists of a one-band tight-binding model and a momentum-independent causal self-energy,…

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Experimental observation of repulsively bound magnons
Zhe Wang, Catalin-Mihai Halati, Jean-Sébastien Bernier, Alexey Ponomaryov, Denis I Gorbunov, Sandra Niesen, Oliver Breunig, J Michael Klopf, Sergei Zvyagin, Thomas Lorenz, Alois Loidl and Corinna Kollath

Nature 631 8022, 760-764 (2024)

Stable composite objects, such as hadrons, nuclei, atoms, molecules and superconducting pairs, formed by attractive forces are ubiquitous in nature. By contrast, composite objects stabilized by means of repulsive forces were long thought to be theoretical constructions owing to their fragility in…

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Mott Transition for a Lieb-Liniger Gas in a Shallow Quasiperiodic Potential: Delocalization Induced by Disorder
Hepeng Yao, Luca Tanzi, Laurent Sanchez-Palencia, Thierry Giamarchi, Giovanni Modugno and Chiara D'Errico

Physical Review Letters 133 12, 123401 (2024)

Disorder or quasidisorder is known to favor localization in many-body Bose systems. Here, in contrast, we demonstrate an anomalous delocalization effect induced by incommensurability in quasiperiodic lattices. Loading ultracold atoms in two shallow periodic lattices with equal amplitude and either…

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Effects of forward disorder on quasi-one-dimensional superconductors
Giacomo Arturo Maria Morpurgo and Thierry Giamarchi

Physical Review Research 6 2, 023291 (2024)

We study the competition between disorder and singlet superconductivity in a quasi-one-dimensional (1D) system. We investigate the applicability of the Anderson theorem, namely that time-reversal conserving (nonmagnetic) disorder does not impact the critical temperature, by opposition to…

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Anomalous cooling of bosons by dimensional reduction
Yanliang Guo, Hepeng Yao, Sudipta Dhar, Lorenzo Pizzino, Milena Horvath, Thierry Giamarchi, Manuele Landini and Hanns-Christoph Nägerl

Science Advances 10 7, eadk6870 (2024)

Cold atomic gases provide a remarkable testbed to study the physics of interacting many-body quantum systems. Temperatures are necessarily nonzero, but cooling to the ultralow temperatures needed for quantum simulation purposes or even simply measuring the temperatures directly on the system can…

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Observation of the 2D–1D crossover in strongly interacting ultracold bosons
Yanliang Guo, Hepeng Yao, Satwik Ramanjanappa, Sudipta Dhar, Milena Horvath, Lorenzo Pizzino, Thierry Giamarchi, Manuele Landini and Hanns-Christoph Nägerl

Nature Physics 20 6, 934-938 (2024)

Dimensionality plays an essential role in determining the nature and properties of a physical system. This is particularly evident in quantum systems, where interactions and fluctuations are enhanced in lower dimensions, leading to various different quantum effects. Here we show that strongly…

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Local Noise Spectroscopy of Wigner Crystals in Two-Dimensional Materials
Pavel E Dolgirev, Ilya Esterlis, Alexander A Zibrov, Mikhail D Lukin, Thierry Giamarchi and Eugene Demler

Physical Review Letters 132 24, 246504 (2024)

We propose local electromagnetic noise spectroscopy as a versatile and noninvasive tool to study Wigner crystal phases of strongly interacting two-dimensional electronic systems. In-plane imaging of the local noise is predicted to enable single-site resolution of the electron crystal when the…

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Transport and Nonreciprocity in Monitored Quantum Devices: An Exact Study
Joao Dos Santos Ferreira, Zizhuo Tony Jin, Jochen Mannhart, Thierry Giamarchi and Michele Filippone

Physical Review Letters 132 13, 136301 (2024)

We study noninteracting fermionic systems undergoing continuous monitoring and driven by biased reservoirs. Averaging over the measurement outcomes, we derive exact formulas for the particle and heat flows in the system. We show that these currents feature competing elastic and inelastic…

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Dirac impurity in a Luttinger liquid
Lorenzo Gotta and Thierry Giamarchi

Physical Review B 110 16, 165116 (2024)

We consider a linearly dispersing quantum impurity interacting through a contact density-density term with a one-dimensional (1D) superfluid described by the Tomonaga-Luttinger liquid theory. Using a linked-cluster expansion we characterize the impurity dynamics by calculating approximate…

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Conversion of angular momentum into charge at picosecond timescales in the LaAlO3 / SrTiO3 interface
Anas El Hamdi, Artem Levchuk, Cosimo Gorini, Margherita Boselli, Vincent Juvé, Tadele Orbula Otomalo, Gwenaëlle Vaudel, Stefano Gariglio, Pascal Ruello, Jean-Yves Chauleau and Michel Viret

Physical review. B 110 5, 054412 (2024)

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Switchable tribology of ferroelectrics
Seongwoo Cho, Iaroslav Gaponenko, Kumara Cordero-Edwards, Jordi Barceló-Mercader, Irene Arias, Daeho Kim, Céline Lichtensteiger, Jiwon Yeom, Loïc Musy, Hyunji Kim, Seung Min Han, Gustau Catalan, Patrycja Paruch and Seungbum Hong

Nature communications 15 387 (2024)

Switchable tribological properties of ferroelectrics offer an alternative route to visualize and control ferroelectric domains. Here, we observe the switchable friction and wear behavior of ferroelectrics using a nanoscale scanning probe—down domains have lower friction coefficients and show…

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REBCO tapes for applications in ultra-high fields: critical current surface and scaling relations
Carmine Senatore, Marco Bonura and Tommaso Bagni

Superconductor science and technology 37 11, 115013 (2024)

REBa2Cu3O 7− x (REBCO) tapes produced by leading manufacturers were tested at UNIGE to characterize the dependence of the critical current on temperature, field intensity and orientation. This measurement campaign was carried out in the frame of international…

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Role of the coupling of the electronic transitions on the order of the metal-to-insulator phase transition in nickelates
Lucia Varbaro, Lukas Alexander Korosec, Chih-Ying Hsu, Duncan T.L. Alexander, Nicolas Jaouen and Jean-Marc Triscone

APL materials 12 8, 081120 (2024)

Rare-earth nickelates (chemical formula RNiO3, R being a rare-earth cation) display a temperature-dependent metal-to-insulator transition (MIT) together with a breathing distortion of the NiO6 octahedra units at a temperature ranging from 0 to 600 K depending on the size of…

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Nano-ARPES study of moiré systems and Td-MoTe2: from flat bands to electron-phonon coupling
Julia Issing

Thèse (2024)

Thinning a bulk material down to a few atomic layers or even to a monolayer influences its physical properties considerably. Such two-dimensional materials can also be used to engineer new correlated phases by stacking them on top of each other. In the present thesis, I present my work on twisted…

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High-Entropy Superconducting materials
Pablo Cayado Llosa and Jens Hänisch

High Entropy Alloys – Composition and Microstructure Design (2024)

High-entropy alloys are a rapidly evolving field of materials research and have gained increasing attention in recent years. Characterized by their multicomponent compositions, they were originally created by mixing a multitude of metallic elements and expanded the idea of traditional alloy design, …

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Evidence of Gd substitution for Y in YBCO films with Gd excess
P. Reale, V. Pinto, Pablo Cayado Llosa, G. Celentano, A. Angrisani Armenio, A. Rufoloni, A. Santoni and F. D’Acapito

Journal of alloys and compounds 983, 173921 (2024)

Gd-YBa2Cu3O7-δ (Gd-YBCO) thin films with 10 mol% and 20 mol% excess-Gd concentration with respect to Y were investigated at the Gd L3 and Y K core absorption edges by EXAFS spectroscopy with the aim of determining the local structure of the Gd…

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DSDApp: An Open-Access Tool for Definitive Screening Design
Ryoichiro Hayasaka, Jens Hänisch and Pablo Cayado Llosa

Journal of open research software 12 1, 2 (2024)

Definitive Screening Design (DSD) is a powerful design of experiment technique employed to find significant factors (parameters) and optimize the factor levels in many experiments of different fields. However, making its design and analyzing the obtained results usually requires expensive software…

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Anomalous electrons in a metallic kagome ferromagnet
Sandy Adhitia Ekahana, Y. Soh, Anna Tamai, Daniel Gosálbez-Martínez, Mengyu Yao, Andrew Scott Hunter, Wenhui Fan, Yihao Wang, Junbo Li, Armin Kleibert, C. A. F. Vaz, Junzhang Ma, Yimin Xiong, Oleg V. Yazyev, Felix Baumberger, Ming Shi and Gabriel Aeppli

Nature 627, 67-72 (2024)

Ordinary metals contain electron liquids within well-defined ‘Fermi’ surfaces at which the electrons behave as if they were non-interacting. In the absence of transitions to entirely new phases such as insulators or superconductors, interactions between electrons induce scattering that is…

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H-Induced local disorder in the structure of Ti2Ni-type Hf(Zr)4Fe2Ox compounds
I.Yu. Zavaliy, I.v. Koval'chuck, R.v. Denys, Radovan Cerny, V. Pecharsky and P. Zavalij

Journal of alloys and compounds 980, 173531 (2024)

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Phonon promoted charge density wave in topological kagome metal ScV6Sn6
Yong Hu, Junzhang Ma, Yinxiang Li, Yuxiao Jiang, Dariusz Jakub Gawryluk, Tianchen Hu, Jérémie Teyssier, Volodymyr Multian, Zhouyi Yin, Shuxiang Xu, Soohyeon Shin, Igor Plokhikh, Xinloong Han, Nicholas C. Plumb, Yang Liu, Jia-Xin Yin, Zurab Guguchia, Yue Zhao, Andreas P. Schnyder, Xianxin Wu, Ekaterina Pomjakushina, M. Zahid Hasan, Nanlin Wang and Ming Shi

Nature communications 15 1 (2024)

Charge density wave (CDW) orders in vanadium-based kagome metals have recently received tremendous attention, yet their origin remains a topic of debate. The discovery of ScV 6 Sn 6 , a bilayer kagome metal featuring an intriguing $$\sqrt{3}\times\sqrt{3}\times3$$ 3 × 3 × 3…

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Dual Second Harmonic Generation and Up-Conversion Photoluminescence Emission in Highly-Optimized LiNbO3 Nanocrystals Doped and Co-Doped with Er3+ and Yb3+
Kévin Bredillet, Florian Riporto, Tianhao Guo, Ameni Dhouib, Volodymyr Multian, Virginie Monnier, Paulí Figueras Llussà, Sandrine Beauquis, Luigi Bonacina, Yannick Mugnier and Ronan Le Dantec

Nanoscale (2024)

Preparation from the aqueous alkoxide route of doped and co-doped lithium niobate nanocrystals with Er 3+ and Yb 3+ ions, and detailed investigations of their optical properties are presented in this comprehensive…

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New Phases in the Sc−Mn−Si and Sc−Mn−Al−Si Systems Through Molten Indium Flux Synthesis
Robin Lefèvre, Félix Eder and Fabian von Rohr

Helvetica Chimica Acta 107 4, e202400018 (2024)

Through the application of synthesis via molten indium flux, we have been able to expand the ternary Sc−Mn−Si system and the quaternary Sc−Mn−Al−Si system. Specifically, we report on five previously unknown chemical compounds, namely β-ScMnSi2, Sc4+xMn4Si7–2x, Sc2Mn4Si5, Sc2Mn3Si4, and …

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Delusive chirality and periodic strain pattern in moiré systems
Arpad Pasztor, Ishita Pushkarna and Christoph Renner

2D materials 11 3, 035017 (2024)

Geometric phase analysis (GPA) is a widely used technique for extracting displacement and strain fields from scanning probe images. Here, we demonstrate that GPA should be implemented with caution when several fundamental lattices contribute to the image, in particular in twisted heterostructures…

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Atomic Scale Periodic Charge Modulations, Nematic Gap Variations, and Vortex Core Signatures as a function of Doping in Bi-2212
Tejas Parasram Singar

Thèse, 169 (2024)

High-temperature superconductors have been extensively studied over the past four decades. Much progress has been made in terms of understanding the basic fundamental mechanisms that lead to exceptionally high transition temperatures as compared to conventional superconductors. However, many…

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Planar deposition of Nb thin films by HiPIMS for superconducting radiofrequency applications
Carlota Pereira de Alemida Carlos, Stewart Leith, Guillaume Rosaz, Stephan Pfeiffer and Carmine Senatore

Vacuum 227, 113354 (2024)

Cost efficiency and sustainability are critical challenges for future accelerator machines. Nb-coated Cu (Nb/Cu) superconducting radiofrequency (SRF) accelerating cavities, while requiring R&D to meet high acceleration gradient performance standards, show potential for addressing these challenges….

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Investigating the effect of rolling deformation on the electro-mechanical limits of Nb3Sn wires produced by RRP® and PIT technologies
Tommaso Bagni, Ciro Calzolaio, Gianmarco Bovone, José Ferradas Troitino, Christian Barth, A. Ballarino and Carmine Senatore

Superconductor science and technology 37 9, 095013 (2024)

Future high-field magnets for particle accelerators hinge on the crucial development of advanced Nb3Sn wires engineered to withstand the large stresses generated during magnet assembly and operation. The superconducting properties of Nb3Sn enable the design of compact…

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Thickness effect on superconducting properties of niobium films for radio-frequency cavity applications
Antonio Bianchi, Marco Bonura, Carlota Pereira de Alemida Carlos, Stewart Leith, Guillaume Rosaz, Carmine Senatore and Walter Venturini Delsolaro

Superconductor science and technology 37 8, 085005 (2024)

Niobium-coated copper radio-frequency cavities are cost-effective alternatives to bulk niobium cavities, given the lower material costs of copper substrates and their operation in liquid helium at around 4.2 K. However, these cavities historically exhibited a gradual degradation in performance…

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Signatures of polarized chiral spin disproportionation in rare earth nickelates
Jiarui Li, Robert J. Green, Claribel Dominguez Ordonez, Abraham Levitan, Yi Tseng, Sara Catalano, Jennifer Fowlie, Ronny Sutarto, Fanny Rodolakis, Lucas Korol, Jessica L. McChesney, John W. Freeland, Dirk Van Der Marel, Marta Gibert and Riccardo Comin

Nature communications 15 1, 7427 (2024)

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Electron-Beam Writing of Atomic-Scale Reconstructions at Oxide Interfaces
Greta Segantini, Chih-Ying Hsu, Willem Rischau, Patrick Blah, Mattias Matthiesen, Stefano Gariglio, Jean-Marc Triscone, Duncan T L Alexander and Andrea Caviglia

Nano letters, acs.nanolett.4c02913 (2024)

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Exploring Ferroelectric Domain-Wall Dynamics through Power-Law Distributions via Scanning Probe Microscopy
Ralph Adam Yap Bulanadi

Thèse, 222 (2024)

We here leverage scanning probe microscopy, sensitive to both structural and functional properties of ferroelectric domains, in order to change, measure, and characterise the variety of transitions (and transition-like behaviours in the highly nonlinear dynamics accompanying polarisation reversal…

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Feedback loop dependent charge density wave imaging by scanning tunneling spectroscopy
Alessandro Scarfato, Arpad Pasztor, Lihuan Sun, Ivan Maggio-Aprile, Vincent Pasquier, Tejas Parasram Singar, Andreas Ørsted, Ishita Pushkarna, Marcello Spera, Enrico Giannini and Christoph Renner

Physical review. B 110 8, 085109 (2024)

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Magnets for a Muon Collider—Needs and Plans
L. Bottura, C. Accettura, N. Amemiya, B. Auchmann, J.s. Berg, A. Bersani, A. Bertarelli, F. Boattini, B. Bordini, P. Borges de Sousa, M. Breschi, B. Caiffi, X. Chaud, F. Debray, A. Dudarev, M. Eisterer, S. Fabbri, S. Farinon, P. Ferracin, H. De Gersem, A. Kario, A. Kolehmainen, J. Kosse, J. Lorenzo Gomez, R. Losito, S. Mariotto, M. Mentink, T. Mulder, R. Musenich, D. Novelli, T. Ogitsu, M. Palmer, J. Pavan, H. Piekarz, A. Portone, L. Quettier, E. Rochepault, L. Rossi, T. Salmi, H. Schneider-Muntau, Carmine Senatore, M. Statera, H.h.j. Ten Kate, P. Testoni, G. Vallone, A. Verweij, R. Van Weelderen, M. Wozniak, A. Yamamoto, Y. Yang, Y. Zhai and A. Zlobin

IEEE transactions on applied superconductivity 34 5 (2024)

We describe the magnet challenges for a Muon Collider, an exciting option considered for the future of particle physics at the energy frontier. Starting from the comprehensive work performed by the US Muon Accelerator Program, we have reviewed the performance specifications dictated by beam physics …

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Gap collapse and flat band induced by uniaxial strain in 1T − TaS2
C. W. Nicholson, F. Petocchi, B. Salzmann, Catherine Witteveen, M. Rumo, G. Kremer, O. Ivashko, Fabian von Rohr, P. Werner and C. Monney

Physical review. B 109 3, 035167 (2024)

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Controlling crystal cleavage in Focused Ion Beam shaped specimens for surface spectroscopy
Andrew Scott Hunter, C. Putzke, Iaroslav Gaponenko, Anna Tamai, Felix Baumberger and P. J. W. Moll

Review of scientific instruments 95, 033905 (2024)

Our understanding of quantum materials is commonly based on precise determinations of their electronic spectrum by spectroscopic means, most notably angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM). Both require atomically clean and flat crystal surfaces…

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Conceptual design of an HTS Canted Cosine Theta dipole magnet for research and hadron therapy accelerators
E. De Matteis, A. Ballarino, D. Barna, A. Carloni, A. Echeandia, G. Kirby, T. Lecrevisse, J. Lucas, S. Mariotto, J. van Nugteren, M. Prioli, L. Rossi, Carmine Senatore, M. Sorbi, S. Sorti, M. Statera, F. Toral and R.u. Valente

IEEE transactions on applied superconductivity 34 5, 4402505 (2024)

The European project IFAST’s WP8 Innovative Superconducting Magnets aims to develop the technology of Canted Cosine Theta (CCT) magnets wound with High-Temperature Superconductors (HTS). Superconducting magnets could lower the size and cost of synchrotrons and gantries for research and hadron…

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Influence of the heat treatment on the layer JC of internal-Sn Nb3Sn wires with internally oxidized nanoparticles
Francesco Lonardo, Gianmarco Bovone, Florin Buta, Marco Bonura, Tommaso Bagni, B. Medina-Clavijo, A. Ballarino, S. C. Hopkins, T. Boutboul and Carmine Senatore

IEEE transactions on applied superconductivity 34 5, 6000305 (2024)

We evaluated various heat treatments (HT) for maximizing the Nb 3 Sn layer thickness while retaining a refined grain microstructure in low filament count internal-Sn Nb 3 Sn Rod-In-Tube wires with internally oxidized nanoparticles. These wires were manufactured in our…

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Observation of naturally canalized phonon polaritons in LiV2O5 thin layers
Ana I. F. Tresguerres-Mata, Christian Lanza, Javier Taboada Gutierrez, Joseph. R. Matson, Gonzalo Álvarez-Pérez, Masahiko Isobe, Aitana Tarazaga Martín-Luengo, Jiahua Duan, Stefan Partel, María Vélez, Javier Martín-Sánchez, Alexey Y. Nikitin, Joshua D. Caldwell and Pablo Alonso-González

Nature communications 15 1, 2696 (2024)

Polariton canalization is characterized by intrinsic collimation of energy flow along a single crystalline axis. This optical phenomenon has been experimentally demonstrated at the nanoscale by stacking and twisting van der Waals (vdW) layers of α-MoO3, by combining α-MoO3

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Loss of memory of an elastic line on its way to limit cycles
Elisabeth Agoritsas and Jonathan Barés

Physical review. E 109 4, L042901 (2024)

Oscillatory-driven amorphous materials forget their initial configuration and converge to limit cycles. Here we investigate this memory loss under a nonquasistatic drive in a minimal model system, with quenched disorder and memory encoded in a spatial pattern, where oscillating protocols are…

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Type-II superconductivity in the Dirac semimetal PdTe2
Ritu Gupta, Catherine Witteveen, Debarchan Das, Fabian von Rohr and Rustem Khasanov

Physical review. B 109 13, 134507 (2024)

We report on the microscopic superconducting properties of the Dirac semimetal PdTe2. In this study, we have focused on mosaic crystals of PdTe2, and used detailed zero-field and transverse-field muon-spin relaxation/rotation (μSR), ac-magnetic susceptibility, and resistivity measurements to…

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Anomalous temperature dependence of phonon lifetimes in metallic VO2
Willem Rischau, Artem Korshunov, Volodymyr Multian, Sara Almudena Lopez Paz, Chubin Huang, Lucia Varbaro, Jérémie Teyssier, Yoav Kalcheim, Stefano Gariglio, Alexei Bosak, Jean-Marc Triscone and Javier del Valle

Physical review. B, Condensed matter 109, 094122 (2024)

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Controlling the Magnetic Properties of the van der Waals Multiferroic Crystals Co1–xNixI2
Anastasiia Lukovkina, Sara Almudena Lopez Paz, Céline Besnard, Laure Guenee, Fabian von Rohr and Enrico Giannini

Chemistry of materials 36 12, 6237-6245 (2024)

The structurally related compounds NiI2 and CoI2 are multiferroic van der Waals materials in which helimagnetic orders exist simultaneously with electric polarization. Here, we report on the evolution of the crystal structure and of the magnetic properties across solid…

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Highly confined epsilon-near-zero and surface phonon polaritons in SrTiO3 membranes
Ruijuan Xu, Iris Crassee, Hans A. Bechtel, Yixi Zhou, Adrien Bercher, Lukas Alexander Korosec, Willem Rischau, Jérémie Teyssier, Kevin J. Crust, Yonghun Lee, Stephanie N. Gilbert Corder, Jiarui Li, Jennifer A. Dionne, Harold Y. Hwang, Alexey Kuzmenko and Yin Liu

Nature communications 15 1, 4743 (2024)

Recent theoretical studies have suggested that transition metal perovskite oxide membranes can enable surface phonon polaritons in the infrared range with low loss and much stronger subwavelength confinement than bulk crystals. Such modes, however, have not been experimentally observed so far….

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Resistive switching of VO2 films grown on a thermal insulator
Willem Rischau, Stefano Gariglio, Jean-Marc Triscone and Javier del Valle

Physical review applied 22 1, 014021 (2024)

Many correlated oxides feature an insulator-to-metal transition as the temperature is increased. In thin films, this transition can be electrically induced by localized Joule heating, resulting in volatile resistive switching. Considering the importance of thermal effects, the thermal conductivity…

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Stability and Voltage Frequency Dynamics of Large-Scale Electric Power Grids
Julian Fritzsch

Thèse (2024)

The energy sector is the largest contributor to global greenhouse gas emissions. Therefore, to effectively combat climate change, conventional fossil-fueled power generation is being replaced by power generation from renewable energy sources, such as solar panels or wind farms. This energy…

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Structural study of nickelate based heterostructures
Lucia Varbaro, Bernat Mundet Bolos, Subhadeep Bandyopadhyay, Claribel Dominguez Ordonez, Jennifer Fowlie, Lukas Alexander Korosec, Chih-Ying Hsu, Duncan T. L. Alexander, Philippe Ghosez and Jean-Marc Triscone

APL materials 12 3, 031104 (2024)

Heterostructures consisting of SmNiO3 and NdNiO3 alternating layers with additional LaAlO3 spacer layers were grown and fully characterized by means of x-ray diffraction, atomic force microscopy, and scanning transmission electron microscopy. A change in the orientation of the orthorhombic…

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The effects of correlated disorder on static and dynamical properties of matter
Amirreza Hemmatzade

Thèse (2024)

Frustration can lead to a disordered ground state with a macroscopic degeneracy. A structural and/or magnetic ice system is one in which this frustration can be described by simple local rules describing the configuration of a tetrahedron – the so-called ice rule. In the case of water-ice this rule …

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Topological valley plasmons in twisted monolayer-bilayer graphene moiré superlattices
Weiwei Luo, Jiang Fan, Alexey Kuzmenko, Wei Cai and Jingjun Xu

Physical review. B 110 3, 035408 (2024)

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The Changing Landscape of Materials Discovery
Fabian von Rohr

Chimia 78 12, 855-861 (2024)

In this perspective, we will discuss the impact of some of the most recent advancements in materials discovery, particularly focusing on the role of robotics, artificial intelligence, and self-driving laboratories, as well as their implications for the Swiss research landscape. While it seems…

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Influence of magnetism on vertical hopping transport in CrSBr
Xiaohanwen Lin, Fan Wu, Sara Almudena Lopez Paz, Fabian von Rohr, Marco Gibertini, Ignacio Gutierrez Lezama and Alberto Morpurgo

Physical review research 6 1, 013185 (2024)

We investigate the c -direction conduction in CrSBr in the linear regime, which is not accessible in other van der Waals (vdW) magnetic semiconductors, because of the unmeasurably low current. The resistivity, which is 10 8 − 10 11 times larger than in the a and b directions, exhibits magnetic…

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Ti4Ir2O : A time reversal invariant fully gapped unconventional superconductor
Debarchan Das, KeYuan Ma, Jan Jaroszynski, Vahid Sazgari, Tomasz Klimczuk, Fabian von Rohr and Zurab Guguchia

Physical review. B 110 17, 174507 (2024)

Here we report muon spin rotation ( μ SR ) experiments on the temperature and field dependence of the effective magnetic penetration depth λ ( T ) in the η -carbide-type suboxide Ti 4 Ir 2 O , a superconductor with a considerably high upper critical field. The temperature dependence of λ ( T ) …

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Bonding states underpinning structural transitions in IrTe2 observed with micro-ARPES
C. W. Nicholson, M. D. Watson, A. Pulkkinen, M. Rumo, G. Kremer, K. Y. Ma, Fabian von Rohr, C. Cacho and C. Monney

Physical review. B 110 20, 205123 (2024)

Competing interactions in low-dimensional materials can produce nearly degenerate electronic and structural phases. We investigate structural phase transitions in layered IrTe 2 for which a number of potential transition mechanisms have been postulated. The spatial coexistence of multiple phases…

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Quantum oscillation signatures of the Bloch-Grüneisen temperature in the Dirac semimetal ZrTe5
S. Galeski, K. Araki, O. K. Forslund, R. Wawrzyńczak, H. F. Legg, P. K. Sivakumar, U. Miniotaite, F. Elson, M. Månsson, Catherine Witteveen, Fabian von Rohr, A. Q. R. Baron, D. Ishikawa, Q. Li, G. Gu, L. X. Zhao, W. L. Zhu, G. F. Chen, Y. Wang, S. S. P. Parkin, D. Grobunov, S. Zherlitsyn, B. Vlaar, D. H. Nguyen, S. Paschen, P. Narang, C. Felser, J. Wosnitza, T. Meng, Y. Sassa, S. A. Hartnoll and J. Gooth

Physical review. B 110 12, L121103 (2024)

The electron-phonon interaction is in many ways a solid state equivalent of quantum electrodynamics. Being always present, the e-p coupling is responsible for the intrinsic resistance of metals at finite temperatures, making it one of the most fundamental interactions present in solids. In typical…

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Nonmonotonic superconducting transition temperature and large bulk modulus in the alloy superconductor Nb4Rh2C1−δ
Lifen Shi, Keyuan Ma, Binbin Ruan, Ningning Wang, Jun Hou, Pengfei Shan, Pengtao Yang, Jianping Sun, Genfu Chen, Zhian Ren, Fabian von Rohr, Bosen Wang and Jinguang Cheng

Physical review. B 110 21, 214520 (2024)

We revised normal-state and superconducting properties of an alloy superconductor N⁢b4⁢R⁢h2⁡C1−𝛿 through electrical transport, magnetic susceptibility, and specific heat. Our results reveal that it is a Pauli paramagnetic bad metal, a strongly coupled superconductor with specific heat…

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Nature of metallic and insulating domains in the CDW system 1T-TaSe2
Michael Straub, Francesco Petocchi, Catherine Witteveen, F. B. Kugler, Andrew Scott Hunter, Yann Alexanian, Gianmarco Gatti, Salony Mandloi, C. Polley, G. Carbone, J. Osiecki, Fabian von Rohr, Antoine Georges, Felix Baumberger and Anna Tamai

Preprint (2024)

We study the electronic structure of bulk 1T-TaSe$_2$ in the charge density wave phase at low temperature. Our spatially and angle resolved photoemission (ARPES) data show insulating areas coexisting with metallic regions characterized by a chiral Fermi surface and moderately correlated…

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Fermi surface and pseudogap in highly doped Sr2IrO4
Yann Alexanian, A. de la Torre, Siobhan Mckeown Walker, Michael Straub, Gianmarco Gatti, Andrew Scott Hunter, Salony Mandloi, Edoardo Cappelli, Sara Ricco, Flavio Yair Bruno, M. Radovic, N. C. Plumb, M. Shi, J. Osiecki, C. Polley, T. K. Kim, P. Dudin, M. Hoesch, R. S. Perry, Anna Tamai and Felix Baumberger

Preprint (2024)

The fate of the Fermi surface in bulk electron-doped Sr$_{2}$IrO$_{4}$ remains elusive, as does the origin and extension of its pseudogap phase. Here, we use high-resolution angle-resolved photoelectron spectroscopy (ARPES) to investigate the electronic structure of Sr$_{2-x}$La$_{x}$IrO$_{4}$ up…

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