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Adiabatic Melting of 4He Crystal in Superfluid 3He at Sub-millikelvin Temperatures

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Abstract

Adiabatic melting of 4He crystal to phase separated 3He–4He solution (at T< 2 mK) is probably the most promising method to cool the dilute phase down to temperatures substantially below 0.1 mK. When started well below the superfluid transition temperature T c of pure 3He, this process allows, in principle, to get the final temperature (T f ) several orders of magnitude less than the initial one (T i ). This work is the first practical implementation of the method below the T c of 3He. The observed cooling factor was T i /T f =1.4 at 0.9 mK, being mainly limited by the bad performance of the superleak filling line, by incomplete solidification of 4He in the cell, and by the improper thermal contact between the cell wall and the liquid.

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Authors and Affiliations

  1. Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, 02015 TKK, Helsinki, Finland

    A. P. Sebedash, J. T. Tuoriniemi, E. M. M. Pentti & A. J. Salmela

  2. P.L. Kapitza Institute for Physical Problems RAS, ul. Kosygina 2, Moscow, 119334, Russia

    A. P. Sebedash & S. T. Boldarev

Authors
  1. A. P. Sebedash
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  2. J. T. Tuoriniemi
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  3. S. T. Boldarev
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  4. E. M. M. Pentti
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  5. A. J. Salmela
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Correspondence to A. P. Sebedash.

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Sebedash, A.P., Tuoriniemi, J.T., Boldarev, S.T. et al. Adiabatic Melting of 4He Crystal in Superfluid 3He at Sub-millikelvin Temperatures. J Low Temp Phys 148, 725–729 (2007). https://doi.org/10.1007/s10909-007-9443-5

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  • DOI: https://doi.org/10.1007/s10909-007-9443-5

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