Abstract
Interest in the critical dynamics of superfluid 4 He in microgravity conditions has motivated the development of new high resolution thermometry technology for use in space experiments near 2 K. We have developed a magnetic thermometer using dilute magnetic alloys of Mn or Fe dissolved in a pure Pd matrix, similar to previous thermometers used at ultra-low temperatures. These metallic thermometers are easy to fabricate, chemically inert, and can have a low thermal resistance to the stage to be measured. Also, the Curie temperature can be varied by changing the concentration of Fe or Mn, making them available for use in a wide temperature range. The derivative of the magnetic susceptibility was measured for PdMn and PdFe between 1.5 K and 4 K using a SQUID magnetometer. These measurements, as well as preliminary noise and drift measurements, show them to have sub-nK resolution with a drift of less than 10 −13 K/s.
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Klemme, B.J., Adriaans, M.J., Day, P.K. et al. PdMn and PdFe: New Materials for Temperature Measurement Near 2 K. Journal of Low Temperature Physics 116, 133–146 (1999). https://doi.org/10.1023/A:1021883011172
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DOI: https://doi.org/10.1023/A:1021883011172