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Ferromagnetism of LaCoO.sub.3./sub. films
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SYSNO ASEP 0534735 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Ferromagnetism of LaCoO3 films Author(s) Sotnikov, A. (AT)
Ahn, K-H. (AT)
Kuneš, Jan (FZU-D) RID, ORCID, SAINumber of authors 3 Article number 082 Source Title SciPost Physics. - : SciPost Foundation - ISSN 2542-4653
Roč. 8, č. 6 (2020), s. 1-21Number of pages 21 s. Language eng - English Country NL - Netherlands Keywords spin-state transition ; electronic-structure ; model Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) Method of publishing Open access Institutional support FZU-D - RVO:68378271 UT WOS 000549932200001 EID SCOPUS 85087376821 DOI 10.21468/SciPostPhys.8.6.082 Annotation We study ferromagnetic ordering and microscopic inhomogeneity in tensile strained LaCoO3 using numerical simulations. We argue that both phenomena originate from effective superexchange interactions between atoms in the high-spin (HS) state mediated by the intermediate-spin excitations. We derive a model of the HS excitation as a bare atomic state dressed by electron and electron-hole fluctuations on the neighbor atoms. We construct a series of approximations to account for electron correlation effects responsible for HS fluctuations and magnetic exchange. The obtained amplitudes and directional dependence of magnetic couplings between the 'dressed' HS states show a qualitative agreement with experimental observations and provide a new physical picture of LaCoO3 films. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2021 Electronic address http://hdl.handle.net/11104/0312913
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