Siqueira, M , Nyeki, J , Cowan, B and Saunders, J (1996) Heat capacity study of the quantum antiferromagnetism of a He-3 monolayer. Physical Review Letters, 76 (11).
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We have measured the heat capacity of the second layer solid in a He-3 film adsorbed on the surface of graphite to temperatures below 1 mK, in the regime where the nuclear exchange interaction is antiferromagnetic. The temperature dependence of the data is described by high temperature series expansions for a 2D Heisenberg antiferromagnet on a triangular lattice. There is no evidence for a phase transition down to J/3. Comparison with J inferred from the magnetization provides a measure of the frustration due to competing antiferromagnetic and ferromagnetic cyclic exchanges.
This is a Submitted version This version's date is: 11/3/1996 This item is not peer reviewed
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