Thermodynamics of a one-dimensional S=1/2 spin-orbital model

Abstract

The thermodynamic properties of a one-dimensional model describing spin dynamics in the presence of a twofold orbital degeneracy are studied numerically using the transfer-matrix renormalization group (TMRG). The model contains an integrable SU(4)-symmetric point and a gapless phase which is SU(4) invariant up to a rescaling of the velocities for spin and orbital degrees of freedom which allows detailed comparison of the numerical results with conformal field theory. We pay special attention to the correlation lengths which show an intriguing evolution with temperature. We find that the model shows an intrinsic tendency towards dimerization at finite temperature even if the ground state is not dimerized.

9 pages, 12 figures

References in corpus (4)

• Orbital-Spin Structure and Coupling to Lattice in RTiO${}_3$ with R=La,Pr,Nd and Sm
• Temperature driven crossover phenomena in the correlation lengths of the one-dimensional t-J model
• Entropy Driven Dimerization in a One-Dimensional Spin-Orbital Model
• Thermodynamics and Crossover Phenomena in the Correlation Lengths of the One-Dimensional t-J Model

Cited by in corpus (5)

• Neutron diffraction study of YVO3, NdVO3, and TbVO3
• Real-time dynamics at finite temperature by DMRG: A path-integral approach
• Accurate computation of low-temperature thermodynamics for quantum spin chains
• Doping a Mott insulator with orbital degrees of freedom
• T-W relation and free energy of the Heisenberg chain at a finite temperature