Seminar – Fermi surface reconstruction by charge order in the pseudogap phase of underdoped copper oxides – Cyril Proust

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Date(s) - 03/03/2015
13 h 00 min - 14 h 00 min

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Ecole de Physique, Auditoire Stueckelberg, 24 quai Ernest-Anserme

« Fermi surface reconstruction by charge order in the pseudogap phase of underdoped copper oxides »

Cyril Proust

 Laboratoire National des Champs Magnétiques Intenses, Toulouse, France.

Over the last years, quantum oscillation measurements [1] have shown that the Fermi surface of underdoped cuprates suffer a drastic modification compare to the large hole-like cylinder observed in the overdoped side [2]. Many studies such as NMR measurements [3], x-ray scattering [4] point to a reconstruction of the Fermi surface due to charge density wave (CDW). Fermi-surface reconstruction and charge modulations are two universal signatures of underdoped cuprates, which begs the following questions: what is the impact of charge order on the electronic properties of underdoped cuprates ? Is the Fermi surface seen by quantum oscillations compatible with a reconstruction by CDW modulations?

After an introduction starting from the observation of quantum oscillations to the discovery of charge order in cuprates, I will present thermodynamic and transport measurements in underdoped cuprates performed in high magnetic fields demonstrating that a phase transition takes place at low temperature. Compelling evidence that the Fermi surface of YBa2Cu3Oy is reconstructed by the CDW order detected by x-ray diffraction comes from the recent discovery of an additional small hole-like pocket in quantum oscillations measurements [5]. The consistency between our quantum oscillation measurements and models of Fermi-surface reconstruction by the CDW order will be discussed.

[1] N. Doiron-Leyraud et al, Nature 447, 565 (2007), N. Barisic et al, Nature Physics 9, 761 (2013)

[2] B. Vignolle et al, Nature 455, 952 (2008)

[3] T. Wu et al, Nature 477, 191 (2011)

[4] G. Ghiringhelli et al , Science 337, 821 (2012) / J. Chang et al, Nature Physics 8, 871 (2012)

[5] N. Doiron-Leyraud et al, Nature Communications 6, 6034 (2015)

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