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Heat capacity and susceptibility of two-dimensional super(3)He solid within the Heisenberg model

The validity of a two-dimensional Heisenberg model for the interpretation of the experimentally observed heat capacity and magnetic susceptibility of the second super(3)He layer solid adsorbed on graphite has been discussed. The proposed theoretical method provides an analytical description of therm...

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Bibliographic Details
Published in:Journal of low temperature physics 2000-01, Vol.119 (5), p.677-690
Main Authors: Antsygina, T N, Chishko, K A
Format: Article
Language:English
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Summary:The validity of a two-dimensional Heisenberg model for the interpretation of the experimentally observed heat capacity and magnetic susceptibility of the second super(3)He 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 n sub(2) have been used. It has been shown that in the ferromagnetic regime the pure Heisenberg behaviour of 2D solid super(3)He occurs and the proposed theory is in excellent agreement with the experimental data for all the temperatures.
ISSN:0022-2291