Spin-Orbital Physics in Transition Metal Oxides

• Authors: Andrzej Oleś
• Languages of publication: EN

Abstracts

EN

We present the main features of the spin-orbital superexchange which describes the magnetic and optical properties of the Mott insulators with orbital degrees of freedom. In contrast to the SU(2) symmetry of spin superexchange, the orbital part of the superexchange obeys the lower cubic symmetry of the lattice and is intrinsically frustrated. This intrinsic frustration and spin-orbital entanglement induce enhanced quantum fluctuations, and we point out a few situations where this leads to disordered states. Strong coupling between the spin and orbital degrees of freedom is discussed on the example of the RVO_3 perovskites, with R standing for rare-earth ion, La,...,Lu. We explain the observed evolution of the orbital T_{OO} and Néel T_{N1} transition temperature in the RVO_3 series with decreasing ionic radius r_R. A few open problems and the current directions of research in the field of spin-orbital physics are pointed out.

Keywords

EN

75.10.Jm; 75.30.Et; 03.67.Mn; 61.50.Ks

Discipline

• 75.30.Et: Exchange and superexchange interactions(see also 71.70.Gm Exchange interactions)
• 03.67.Mn: Entanglement measures, witnesses, and other characterizations(see also 03.65.Ud Entanglement and quantum nonlocality; 42.50.Dv Quantum state engineering and measurements in quantum optics)
• 61.50.Ks: Crystallographic aspects of phase transformations; pressure effects(see also 81.30.Hd in materials science)
• 75.10.Jm: Quantized spin models, including quantum spin frustration

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2009
• Volume: 115
• Issue: 1
• Pages: 36-46

Dates

published

2009-01

Contributors

author

Andrzej Oleś

• Marian Smoluchowski Institute of Physics, Jagellonian University, Reymonta 4, PL-30-059 Kraków, Poland
• Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart, Germany

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Identifiers

DOI

10.12693/APhysPolA.115.36