Abstract
Abstract We present preliminary measurements of the thermal boundary resistance between 3 He-A and sintered silver, and also of the thermal damping force on a vibrating wire. The A-phase is stabilised by a magnetic field in excess of about 0.35 T. Vibrating wire resonators in 3 He-B “contacts” serve as thermometers. The magnitudes of both the boundary resistance and the thermal damping force are found to be comparable to the corresponding B-phase values, and an exponential temperature dependence is evident, in spite of the T 3 dependence of the quasiparticle number density. We propose that Andreev scattering from a non-uniform A-phase texture is responsible.
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