Abstract
The warmup rate of the165Ho-enhanced nuclear spins in a HoVO4 single crystal in contact with dilute3He is shown to be dominated by the Kapitza resistanceR K at low bath temperature (T b <100 mK). This result is obtained from an analysis of the NMR signal during the warmup, following a demagnetization which cools the sample to a temperature of about 5 mK. The temperature variation ofR K (∝T /−3 b< ) is consistent with the acoustic mismatch model, but the magnitude is 40 times smaller than the theoretical predictions for a solid-liquid interface. The spin-lattice relaxation is also estimated, and found to be in agreement with the results of other authors.
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Jacquinot, J.F., Gregg, J.F., Roinel, Y. et al. Kapitza resistance in HoVO4 below 100 mK. J Low Temp Phys 64, 115–127 (1986). https://doi.org/10.1007/BF00681546
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DOI: https://doi.org/10.1007/BF00681546