Abstract

Capacitance thermometers, fabricated from KCl:OH and NaF:OH crystals, have been studied between 0.065 and 2.5 K. Their sensitivity, d lnC/dT, is one to two orders of magnitude greater than that of commercially available capacitance thermometers over most of this temperature range. NaF:OH was tested for magnetic field independence at 20 and 40 kG; KCl:OH has previously been tested in fields up to 50 kG. Magnetoresistance data, obtained using these thermometers, are presented for Speer 200-Ω, 0.5-W carbon resistors in fields of 20 and 40 kG from 0.07 to 0.4 K.

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