The soliton contribution to the specific heat of CsNiF3: quantum effects and out-of-plane fluctuations

The authors apply the semiclassical approach to calculate the combined effect of quantum corrections and out-of-plane fluctuations on the soliton contribution to the specific heat in the one-dimensional easy-plane ferromagnet. They show that the importance of quantum corrections is greatly enhanced by going beyond the sine-Gordon approximation. They argue that the remaining discrepancy in experiments in CsNiF 3 and CHAB arises from the approximations required in the semiclassical approach. The quantitative interpretations of neutron scattering and specific heat data on CsNiF 3 are shown to be closely parallel.