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Thin metal film thermometers, typically 20 Å of Chromel A sandwiched by SiO, have been developed for use below 4 K. These thermometers have good low temperature stability (drift less than ± 0.0005 K/2 days), low noise, small heat capacity (0.1 erg/K·cm2), are insensitive to magnetic fields (less than ±0.001 K/25 kG), and are easily fabricated. Thermometers made with Chromel A are marginally stable at room temperature with a typical shelf life of several weeks.
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Griffin et al. (1974) studied this question.
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