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Effect of spin-orbit coupling on magnetic and orbital order in MgV2O4
Ramandeep Kaur1, Tulika Maitra, Tashi Nautiyal
1Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247667, Uttarakhand, India.
Abstract:
Recent measurements on MgV(2)O(4) single crystals have reignited the debate on the role of spin-orbit (SO) coupling in dictating the orbital order in vanadium spinel systems. Density functional theory calculations were performed using the full-potential linearized augmented-plane-wave method within the local spin density approximation (LSDA), Coulomb correlated LSDA (i.e. LSDA + U), and with SO interaction (LSDA + U + SO) to study the magnetic and orbital ordering in the low temperature phase of MgV(2)O(4). It is observed that, in the experimental antiferromagnetic phase, the spin-orbit coupling affects the orbital order differently in alternate V-atom chains along the c-axis. This observation is consistent with the experimental prediction that the effect of spin-orbit coupling is intermediate between those in the cases of ZnV(2)O(4) and MnV(2)O(4).
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