Alternating spin-orbital order in tetragonal Sr2VO4
M. V. Eremin, J. Deisenhofer, R. M. Eremina, J. Teyssier, D. van der, Marel, and A. Loidl
TL;DR
This paper derives a model for the energy levels of vanadium ions in tetragonal Sr2VO4 considering spin-orbit coupling and superexchange processes, explaining observed spectra and predicting a novel alternating spin-orbital order with thermal fluctuations.
Contribution
It introduces a comprehensive theoretical model that accounts for spin-orbit coupling, crystal field, and superexchange, predicting a new type of spin-orbital order in Sr2VO4.
Findings
Model accurately describes neutron scattering and optical spectra.
Predicts a novel alternating spin-orbital order.
Identifies strong thermal fluctuations of orbital mixing.
Abstract
Considering spin-orbit coupling, the tetragonal crystal-field, and all relevant superexchange processes including quantum interference, we derive expressions for the energy levels of the vanadium ions in tetragonal Sr2VO4. The used parameters of the model Hamiltonian allow to describe well the excitation spectra observed in neutron scattering and optical experiments at low temperatures. The free energy exhibits a minimum which corresponds to a novel alternating spin-orbital order with strong thermal fluctuation of the orbital mixing parameter.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Luminescence Properties of Advanced Materials · Solid State Laser Technologies