The Magnetothermal Resistivity of an Antiferromagnetic Insulator at Low Temperatures. II. A Heisenberg System, Spin-Wave Approximation

Abstract

The magnetothermal resistivity of an insulating uniaxial Heisenberg antiferromagnet in the low-temperature region is calculated by using the spin-wave approximation for the spin system. Heat is assumed to be carried mainly by phonons which are scattered by boundaries and by spin fluctuations; the case where the latter contribution gives a small but field dependent correction to the former one is considered. The magnetic field dependence of the thermal resistivity is numerically estimated and discussed in comparison with that obtained in the molecular-field approximation and in connection with the recent experiment by Metcalfe and Rosenberg.