Magnetic excitations in vanadium spinels

Details Magnetic excitations in vanadium spinels Magnetic excitations in vanadium spinels

2007-11-05

arxiv.org/abs/0711.0732v1

Physics

Condensed Matter

Strongly Correlated Electrons

accepted in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.214434

We study magnetic excitations in vanadium spinel oxides AV$_2$O$_4$ (A=Zn, Mg, Cd) using two models: first one is a superexchange model for vanadium S=1 spins, second one includes in addition spin-orbit coupling, and crystal anisotropy. We show that the experimentally observed magnetic ordering can be obtained in both models, however the orbital ordering is different with and without spin-orbit coupling and crystal anisotropy. We demonstrate that this difference strongly affects the spin-wave excitation spectrum above the magnetically ordered state, and argue that the neutron measurement of such dispersion is a way to distinguish between the two possible orbital orderings in AV$_2$O$_4$.

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