Heat transfer between 3He film and graphite substrate Original Research Article

The thermal conductivity between the 3He solid films and the graphite substrate was measured by the relaxation method between 100 μK and 1 mK. The areal-density dependence of the thermal conductivity shows behavior similar to that of the exchange frequency J both in the submonolayer and in the second layer. These facts indicate that the thermal resistance of the 3He solid film itself is the bottleneck of the heat transfer, and inside the 3He solid film heat is transferred by magnetic mechanisms. They also imply that the 3He solid film is thermally connected with the graphite substrate rather strongly but only at some local spots.