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Dimerization versus orbital-moment ordering in a Mott insulator YVO3
Peter Horsch1, Giniyat Khaliullin, Andrzej M Oleś
1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Physical Review Letters
|February 3, 2004
Summary
We investigated the spin-orbital model for cubic vanadates, revealing a novel phase driven by spin-orbit coupling. This phase explains magnetic behaviors like spin canting and reduced magnetization in YVO3.
Area of Science:
- Condensed matter physics
- Materials science
- Quantum magnetism
Background:
- Cubic vanadates exhibit complex magnetic and orbital ordering.
- Understanding the interplay between spin-orbit coupling and Hund's exchange is crucial.
Purpose of the Study:
- To investigate the phase diagram of the spin-orbital model for cubic vanadates.
- To elucidate the mechanism behind spin canting and reduced magnetization in YVO3.
Main Methods:
- Exact diagonalization
- Mean-field theory
Main Results:
- Spin-orbit coupling competes with Hund's exchange, stabilizing a novel phase.
- Orbital magnetic moment ordering is stabilized by VO6 octahedra tilting.
- Orbital instability in the antiferromagnetic phase modulates magnetic exchange constants.
- Magnon splitting observed due to orbital dimerization.
Conclusions:
- The model qualitatively explains experimental observations in YVO3.
- Orbital degrees of freedom play a significant role in the magnetic properties of vanadates.