Second cluster integral from the spectrum of an infinite XXZ spin chain
arXiv:1408.4586 · doi:10.1016/j.aop.2014.12.020
Abstract
First and second terms of the low-temperature cluster expansion for the free energy density of a magnetically polarized spin chain is obtained within the propagator approach suggested by E. W. Montroll and J. C. Ward. All the calculations employ only one- and two-magnon infinite-chain spectrums. In the -point the result reproduces the well known S. Katsura's formula obtained 50 years ago by finite-chain calculations.
14 pages