Excitonic Magnetism in Van Vleck-type d4 Mott Insulators

被引：236

作者：

Khaliullin, Giniyat ^{[1
]}

机构：

[1] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 19期

关键词：

SPIN; TRANSITION; CRYSTAL; CA2RUO4; CHAINS; FIELD;

D O I：

10.1103/PhysRevLett.111.197201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In Mott insulators with the t(2g)(4) electronic configuration such as of Re3+, Ru4+, Os4+, and Ir5+ ions, spin-orbit coupling dictates a Van Vleck-type nonmagnetic ground state with an angular momentum J = 0, and the magnetic response is governed by gapped singlet-triplet excitations. We derive the exchange interactions between these excitons and study their collective behavior on different lattices. In perovskites, a conventional Bose condensation of excitons into a magnetic state is found, while an unexpected one-dimensional behavior supporting spin-liquid states emerges in honeycomb lattices, due to the bond directional nature of exciton interactions in the case of 90 degrees d-p-d bonding geometry.

引用

页数：5

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