Indexed on: 01 Jun '00Published on: 01 Jun '00Published in: Journal of low temperature physics
The validity of a two-dimensional Heisenberg model for the interpretation of the experimentally observed heat capacity and magnetic susceptibility of the second 3He layer solid adsorbed on graphite has been discussed. The proposed theoretical method provides an analytical description of thermodynamic functions in the whole temperature range. To make the theory fit to the experimental data two independent adjustable parameters: the exchange constant J and the number of “magnetically active” spins n2 have been used. It has been shown that in the ferromagnetic regime the pure Heisenberg behaviour of 2D solid 3He occurs and the proposed theory is in excellent agreement with the experimental data for all the temperatures.