High-temperature series expansion of the Helmholtz free energy of the quantum spin-S XYZ chain | |
Article | |
关键词: NEUTRON-SCATTERING; HEISENBERG CHAIN; HALDANE-GAP; ANTIFERROMAGNET; DYNAMICS; CSVCL3; THERMODYNAMICS; MODEL; | |
DOI : 10.1103/PhysRevB.72.172414 | |
来源: SCIE |
【 摘 要 】
We consider the XYZ chain model of arbitrary spin S in the high-temperature region, with external magnetic field and single-ion anisotropy term. Our high-temperature expansion of the Helmholtz free energy is analytic in the parameters of the model for S, which may range from 1/2 to the classical limit of infinite spin (S ->infinity). Our expansion is carried out up to order (J beta)(5). Our results agree with numerical results of the specific heat per site for S=1/2, obtained by the Bethe ansatz, with h=0 and D=0. Finally, we show that the magnetic susceptibility and magnetization of the quantum model can be well approximated by their classical analog in this region of temperature.
【 授权许可】
Free