SIMULATIONS OF THE QUANTUM MODEL FOR CSNIF3

Large-scale simulations are performed for a quantum model of CsNiF3, c hoosing the competing sets of microscopic parameters known in literatu re. Both quantum transfer matrix and the finite-chain diagonalization techniques are applied. High resolution data are obtained from a finit e-size analysis of the simulation results and are compared with the av ailable static measurements, revealing the best agreement for the valu es J/k(B) = 20.5 K and A/J = 0.425. In addition, the validity of a the oretical self-consistent harmonic approximation approach is confirmed and a zero-field specific heat experiment, crucial to resolve some rem aining ambiguity, is suggested.