Structural, orbital, and magnetic order in vanadium spinels

Details Structural, orbital, and magnetic order in vanadium spinels Structural, orbital, and magnetic order in vanadium spinels

2004-01-13

arxiv.org/abs/cond-mat/0401203v3

Phys. Rev. Lett. 93, 157206 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

v3: streamlined introduction

Scientific paper

10.1103/PhysRevLett.93.157206

Vanadium spinels (ZnV_2O_4, MgV_2O_4, and CdV_2O_4) exhibit a sequence of structural and magnetic phase transitions, reflecting the interplay of lattice, orbital, and spin degrees of freedom. We offer a theoretical model taking into account the relativistic spin-orbit interaction, collective Jahn-Teller effect, and spin frustration. Below the structural transition, vanadium ions exhibit ferroorbital order and the magnet is best viewed as two sets of antiferromagnetic chains with a single-ion Ising anisotropy. Magnetic order, parametrized by two Ising variables, appears at a tetracritical point.

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