Magnetic excitations in vanadium spinels

Abstract

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${}_4$.

accepted in Phys. Rev. B

References in corpus (8)

• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Structural, orbital, and magnetic order in vanadium spinels
• Orbital and spin chains in ZnV2O4
• Magnetic transition and orbital degrees of freedom in vanadium spinels
• Orbital order in ZnV${}_2$O${}_4$
• Orbital and magnetic transitions in geometrically-frustrated vanadium spinels -- Monte Carlo study of an effective spin-orbital-lattice coupled model --
• Orbital order in vanadium spinels
• Theory of successive transitions in vanadium spinels and order of orbitals and spins

Cited by in corpus (9)

• Spin and Orbital Order of the Vanadium Spinel MgV2O4
• Magnetic order and ice rules in the multiferroic spinel FeV2O4
• Advances in ab-initio theory of Multiferroics. Materials and mechanisms: modelling and understanding
• Low-temperature magnetic ordering and structural distortions in Vanadium Sesquioxide (V${}_2$O${}_3$)
• Structural transition and orbital glass physics in near itinerant CoV2O4
• Large-J approach to strongly coupled spin-orbital systems
• Magnetic excitations and anomalous spin wave broadening in multiferroic FeV2O4
• Orbital disorder induced by charge fluctuations in vanadium spinels
• Spin-orbital correlations from complex orbital order in MgV${}_2$O${}_4$