Abstract
The heat capacities of the second layer 3He solid films adsorbed on a graphite surface were measured in magnetic fields up to 300 G. The applied magnetic fields are considerably weaker than the exchange interaction between the nuclear spins of 3He. The results reveal unexpected behaviors. In the antiferromagnetic film, the double peak structure of heat capacity is enhanced by the magnetic fields. In the ferromagnetic films, the heat capacity peaks are remarkably reduced. These results might indicate that the ferromagnetic films do not demonstrate simple fully saturated ferromagnetism and that the magnetic fields strongly affect magnetic frustration.
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