Abstract
Indium has a number of properties that make it an attractive material for nuclear cooling. A small test refrigerator of indium has been constructed and has cooled melting3He to 0.9 mK. Its performance demonstrates the favorable comparison of indium with PrNi5 for two-stage refrigerators. From specific heat measurements between 1 and 10 mK, the quadrupole interaction has been determined. A value ofe 2qQ/h=−47.8MHz is obtained for the quadrupole coupling, with a negative electric field gradient.
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On leave from Walther Meissner Institute, Garching, West Germany.
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Tang, YH., Adams, E.D., Uhlig, K. et al. Nuclear cooling and the quadrupole interaction of indium. J Low Temp Phys 60, 351–363 (1985). https://doi.org/10.1007/BF00681661
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DOI: https://doi.org/10.1007/BF00681661