Low-Temperature Specific Heat of Spin-1/2 Anisotropic Heisenberg Ring

Abstract

Low-temperature specific heat of Hei,senberg-Ising ring' at j.dJ<1 is calculated by the method of non-linear integral equations. Specific heat in constant magnetic field (Ce) is proportional to temperature (T) at l2.a0HJ<C1+.d)J. In particular lim lim CelT is 28/(3Jsin8) where