Two-stage nuclear demagnetization has been performed using PrCu6 and Cu as coolants. The Cu nuclear stage reached temperatures as low as 10 ΜK with a rate of temperature rise of less than a few ΜK/h. The corresponding conduction electron temperature is estimated to be less than 50 ΜK. A nuclear orientation thermometer of Al 54Mn has been successfully used to measure temperatures down to 10 ΜK.
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Supported by the Japan Society for the Promotion of Science.
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ôno, K., Kobayasi, S., Shinohara, M. et al. Two-stage nuclear demagnetization refrigerator. J Low Temp Phys 38, 737–745 (1980). https://doi.org/10.1007/BF00115500
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DOI: https://doi.org/10.1007/BF00115500