Abstract
The authors present the first measurement of the thermal boundary conductance, 1/R[sub B], between the U2D2 spin ordered solid and the B superfluid phases of [sup 3]He. 1/R[sub B] is found to be exceedingly high, roughly seven orders of magnitude greater than that between sintered silver powder and liquid [sup 3]He. For T < 0.56 mK, 1/R[sub B] appeared to be thermally activated, i.e. 1/R[sub B] [approximately] exp(-[var epsilon]/k[sub B]T), with [var epsilon] = 4.5 ([+-] 0.5) mK, close to the superfluid gap energy. We also present a theory involving magnon-quasiparticle coupling as a model to explain the experimental observations.
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