Siqueira, M , Nyeki, J , Cowan, B and Saunders, J (1997) Frustration by multiple spin exchange in 2D solid He-3 films. Physical Review Letters, 78 (13).
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Measurements of the magnetization and heat capacity of the second layer of He-3 films adsorbed on graphite indicate that the evolution of the exchange from antiferromagnetic to ferromagnetic arises from a tuning of the competing exchange processes. At certain coverages the coexistence of an antiferromagnetic heat capacity with a ferromagnetic magnetization is a clear manifestation, predicted by theory, of frustration. At the ferromagnetic anomaly the system is well described by series expansions for a 2D Heisenberg ferromagnet on a triangular lattice.
This is a Submitted version This version's date is: 31/3/1997 This item is not peer reviewed
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