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On the possibility of excitonic magnetism in Ir double perovskites
- 1.0458951 - FZÚ 2017 RIV US eng J - Journal Article
Pajskr, K. - Novák, Pavel - Pokorný, Vladislav - Kolorenč, Jindřich - Arita, R. - Kuneš, Jan
On the possibility of excitonic magnetism in Ir double perovskites.
Physical Review. B. Roč. 93, č. 3 (2016), 1-6, č. článku 035129. ISSN 1098-0121
R&D Projects: GA ČR GA13-25251S
Institutional support: RVO:68378271
Keywords : spin-orbit coupling * double perovskite * excitonic magnetism
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 3.736, year: 2014
We combine several numerical and semianalytical methods to study the 5d double perovskites Sr2YIrO6 and Ba2YIrO6, which were recently proposed to exhibit excitonic magnetism. Starting from the density-functional theory and the constrained random-phase approximation, we construct effective multiband Hubbard models. These are analyzed by means of static and dynamical mean-field theories and strong-coupling expansion. We find both materials to be insulators, but, contrary to the experimental claims, with a large spin gap of several hundreds of meV preventing the formation of an ordered state at low temperature.
Permanent Link: http://hdl.handle.net/11104/0259157
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