Spin--orbital physics in transition metal oxides

Details Spin--orbital physics in transition metal oxides Spin--orbital physics in transition metal oxides

2009-04-08

arxiv.org/abs/0904.1297v1

Acta Phys. Polon. A 115, 36 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

19 pages, 5 figures

Scientific paper

We present the main features of the spin-orbital superexchange which describes the magnetic and optical properties of 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 $R$VO$_3$ perovskites, with $R$ standing for rare-earth ion, La,...,Lu. We explain the observed evolution of the orbital $T_{\rm OO}$ and N\'eel $T_{N1}$ transition temperature in the $R$VO$_3$ 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.

Affiliated with

Also associated with

No associations

Rating

Spin--orbital physics in transition metal oxides does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Spin--orbital physics in transition metal oxides, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spin--orbital physics in transition metal oxides will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-214360