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Thermal resistance between a paramagnetic salt (CMN) and liquid helium at millikelvin temperatures

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Abstract

We report new measurements of the thermal resistance between cerium magnesium nitrate (CMN) and liquid helium. AtT=100 mK, the thermal resistanceR for powdered CMN in contact with liquid3He-4He or liquid3He is about 2000 times the Kapitza boundary resistance. From the field and temperature dependences ofR we conclude that it is dominated by the phonon-bottlenecked spin-lattice resistance. However, if high-purity liquid3He is in contact with CMN, we observe, below 20 mK, a magnetic boundary resistance in parallel to the spin-lattice resistance. This resistance is two orders of magnitude smaller than the spin-lattice resistance atT=10 mK, and is described byR ∝ T 1.4. The absolute values of the magnetic boundary resistance, as well as the spatially limited phonon-bottlenecked resistance, are extremely sensitive to the surface treatment of the CMN crystals.

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Authors and Affiliations

  1. II. Physikalisches Institut, Universität Köln, West Germany

    M. Jutzler

  2. Laboratorium für Festkörperphysik, Eidgenössische Technische Hochschule, Zürich, Switzerland

    A. C. Mota

Authors
  1. M. Jutzler
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  2. A. C. Mota
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Jutzler, M., Mota, A.C. Thermal resistance between a paramagnetic salt (CMN) and liquid helium at millikelvin temperatures. J Low Temp Phys 55, 439–454 (1984). https://doi.org/10.1007/BF00681774

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  • DOI: https://doi.org/10.1007/BF00681774

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