Excitonic magnetism in d6 perovskites

被引：16

作者：

Afonso, J. Fernandez ^{[1
,2
]}

Kunes, J. ^{[1
,2
]}

机构：

[1] TU Wien, Inst Solid State Phys, Wiedner Hauptstr 8, A-1040 Vienna, Austria

[2] Acad Sci Czech Republ, Inst Phys, Cukrovarnicka 10, Prague 16253, Czech Republic

来源：

PHYSICAL REVIEW B | 2017年 / 95卷 / 11期

基金：

欧洲研究理事会;

关键词：

SPIN-STATE; TRANSITION; LACOO3; DISTORTION;

D O I：

10.1103/PhysRevB.95.115131

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We use the LDA+U method to study the possibility of exciton condensation in perovskites of transition metals with the d(6) electronic configuration such as LaCoO3. For realistic interaction parameters we find several distinct solutions exhibiting a spin-triplet exciton condensate, which gives rise to a local spin density distribution while the ordered moments are vanishingly small. Rhombohedral distortion from the ideal cubic structure suppresses the ordered state, contrary to the spin-orbit coupling which enhances the excitonic condensation energy. We explain the trends observed in the numerical simulations with the help of a simplified strong-coupling model. Our results indicate that LaCoO3 is close to the excitonic instability and suggestways how to achieve the exciton condensation.

引用

页数：8

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