Phase transition and critical properties of spin-orbital interacting systems
arXiv:0709.4064 · doi:10.1016/j.physleta.2007.07.030
Abstract
Phase transition and critical properties of Ising-like spin-orbital interacting systems in 2-dimensional triangular lattice are investigated. We first show that the ground state of the system is a composite spin-orbital ferro-ordered phase. Though Landau effective field theory predicts the second-order phase transition of the composite spin-orbital order, however, the critical exponents obtained by the renormalization group approach demonstrate that the spin-orbital order-disorder transition is far from the second-order, rather, it is more close to the first-order, implying that the widely observed first-order transition in many transition-metal oxides may be intrinsic. The unusual critical behavior near the transition point is attributed to the fractionalization of the composite order parameter.
Accepted to Phys. Lett. A
References in corpus (7)
- "Deconfined" quantum critical points
- SU(4) Theory for Spin Systems with Orbital Degeneracy
- Spin Dynamics and Orbital State in LaTiO_3
- Magnetic neutron scattering study of YVO3: Evidence for an orbital Peierls state
- Spin-Orbital Entanglement and Violation of the Goodenough-Kanamori Rules
- Role of Orbitals in the Physics of Correlated Electron Systems
- Ordered valence bond states in symmetric two-dimensional spin-orbital systems