Phase transitions in spin-orbital coupled model for pyroxene titanium oxides

Details Phase transitions in spin-orbital coupled model for pyroxene titanium oxides Phase transitions in spin-orbital coupled model for pyroxene titanium oxides

2004-10-16

arxiv.org/abs/cond-mat/0410411v1

J. Phys. Soc. Jpn. 74 Suppl. 212 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures, proceedings submitted to SPQS2004

Scientific paper

We study the competing phases and the phase transition phenomena in an effective spin-orbital coupled model derived for pyroxene titanium oxides ATiSi2O6 (A=Na, Li). Using the mean-field-type analysis and the numerical quantum transfer matrix method, we show that the model exhibits two different ordered states, the spin-dimer and orbital-ferro state and the spin-ferro and orbital-antiferro state. The transition between two phases is driven by the relative strength of the Hund's-rule coupling to the onsite Coulomb repulsion and/or by the external magnetic field. The ground-state phase diagram is determined. There is a keen competition between orbital and spin degrees of freedom in the multicritical regime, which causes large fluctuations and significantly affects finite-temperature properties in the paramagnetic phase.

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