TY - JOUR
T1 - Magnetic excitations in vanadium spinels
AU - Perkins, N. B.
AU - Sikora, O.
PY - 2007/12/28
Y1 - 2007/12/28
N2 - We study magnetic excitations in vanadium spinel oxides A V2 O4 (A=Zn,Mg,Cd) using two models: the first one is a superexchange model for vanadium S=1 spins and the 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 A V2 O4.
AB - We study magnetic excitations in vanadium spinel oxides A V2 O4 (A=Zn,Mg,Cd) using two models: the first one is a superexchange model for vanadium S=1 spins and the 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 A V2 O4.
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U2 - 10.1103/PhysRevB.76.214434
DO - 10.1103/PhysRevB.76.214434
M3 - Article
AN - SCOPUS:37649014678
SN - 1098-0121
VL - 76
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 21
M1 - 214434
ER -