Seminar: Magnetism and doping effects in spin-orbit coupled Mott insulators – Giniyat Khaliullin, Max Planck Institute for Solid State Research, Stuttgart

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Date(s) - 09/12/2014
13 h 00 min - 14 h 00 min

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

Magnetism and doping effects in spin-orbit coupled Mott insulators
Giniyat Khaliullin
Max Planck Institute for Solid State Research, Stuttgart, Germany

When relativistic spin-orbit coupling dominates over the exchange and orbital-
lattice interactions, the spin and orbital degrees of freedom are no longer
separated, and it is more convenient to formulate the problem in terms of
pseudospin Hamiltonians. This greatly reduces the (initially) large spin-
orbital Hilbert space; however, the resulting low-energy Hamiltonians may
obtain highly nontrivial structure, because the pseudospins inherit bond-
directional and frustrated nature of orbital interactions [1].
After a brief introduction to transition metal compounds with strong spin-
orbit coupling, I will discuss (a) magnetic order and excitations in iridium
oxides [2], and (b) excitonic magnetism and doping effects in Van Vleck-type
d4 Mott insulators such as ruthenates and osmates [3].
[1] G. Khaliullin, Prog. Theor. Phys. Suppl. 160, 155 (2005).
[2] G. Jackeli and G. Khaliullin, Phys. Rev. Lett. 102, 017205 (2009);
J. Chaloupka, G. Jackeli, and G. Khaliullin, Phys. Rev. Lett. 105, 027204
(2010); 110, 097204 (2013).
[3] G. Khaliullin, Phys. Rev. Lett. 111, 197201 (2013);
J. Chaloupka and G. Khaliullin (unpublished).

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