Ferromagnetism of LaCoO3 films

被引：5
作者：
Sotnikov, Andrii [1 ,2 ]
Ahn, Kyo-Hoon [1 ,3 ]
Kunes, Jan [1 ,4 ]
机构：
[1] TU Wien, Inst Solid State Phys, Wiedner Hauptstr 8, A-1020 Vienna, Austria
[2] NSC KIPT, Akhiezer Inst Theoret Phys, UA-61108 Kharkiv, Ukraine
[3] Korea Univ, Div Display & Semicond Phys, Sejong 30019, South Korea
[4] Czech Acad Sci, Inst Phys, Slovance 2, Prague 18221 8, Czech Republic
来源：
SCIPOST PHYSICS | 2020年 / 8卷 / 06期
基金：
新加坡国家研究基金会; 欧洲研究理事会;
关键词：
SPIN-STATE TRANSITION; ELECTRONIC-STRUCTURE; MODEL;
D O I：
10.21468/SciPostPhys.8.6.082
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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.
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页数：21
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