Low temperature magnetic thermometry with LSCI 372 AC Resistance Bridge
Abstract
Electronic paramagnets, such as salts and metallic alloys, were used in the past as a convenient way to measure ultra-low temperatures. Custom-built sensors demonstrated simple 1/T temperature dependence of magnetisation and excellent thermal equilibration times in milliKelvin temperature range.
Modern temperature controllers are part of the 3He-4He dilution refrigerators automated systems, and can measure both resistance and reactance of commercially available temperature sensors.
Here we demonstrate an example of such a system, based LCSI 372 AC resistance bridge. It enables in-situ calibrations of Cerium Magnesium Nitrate as well as PdFe paramagnetic susceptibility sensors against calibrated resistive sensors.
Such calibrations are validated with noise thermometry and superconducting fixed point devices down to 8 mK.
Modern temperature controllers are part of the 3He-4He dilution refrigerators automated systems, and can measure both resistance and reactance of commercially available temperature sensors.
Here we demonstrate an example of such a system, based LCSI 372 AC resistance bridge. It enables in-situ calibrations of Cerium Magnesium Nitrate as well as PdFe paramagnetic susceptibility sensors against calibrated resistive sensors.
Such calibrations are validated with noise thermometry and superconducting fixed point devices down to 8 mK.
