Finite temperature spin-dynamics and phase transitions in spin-orbital models

Details Finite temperature spin-dynamics and phase transitions in spin-orbital models Finite temperature spin-dynamics and phase transitions in spin-orbital models

2009-08-06

arxiv.org/abs/0908.0800v2

Phys. Rev. B 80, 180418(R) (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages

Scientific paper

10.1103/PhysRevB.80.180418

We study finite temperature properties of a generic spin-orbital model relevant to transition metal compounds, having coupled quantum Heisenberg-spin and Ising-orbital degrees of freedom. The model system undergoes a phase transition, consistent with that of a 2D Ising model, to an orbitally ordered state at a temperature set by short-range magnetic order. At low temperatures the orbital degrees of freedom freeze-out and the model maps on to a quantum Heisenberg model. The onset of orbital excitations causes a rapid scrambling of the spin spectral weight away from coherent spin-waves, which leads to a sharp increase in uniform magnetic susceptibility just below the phase transition, reminiscent of the observed behavior in the Fe-pnictide materials.

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