PdMn and PdFe: New Materials for Temperature Measurement Near 2 K

B. J. Klemme, M. J. Adriaans, P. K. Day, D. A. Sergatskov, T. L. Aselage, R. V. Duncan

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Abstract

Interest in the critical dynamics of superfluid 4He 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.

Original languageEnglish
Pages (from-to)133-146
Number of pages14
JournalJournal of Low Temperature Physics
Volume116
Issue number1-2
DOIs
StatePublished - 1999

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    Klemme, B. J., Adriaans, M. J., Day, P. K., Sergatskov, D. A., Aselage, T. L., & Duncan, R. V. (1999). PdMn and PdFe: New Materials for Temperature Measurement Near 2 K. Journal of Low Temperature Physics, 116(1-2), 133-146. https://doi.org/10.1023/a:1021883011172