Thermalization of magnetic calorimeters

Details Thermalization of magnetic calorimeters Thermalization of magnetic calorimeters

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605...71e&link_type=abstract

LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p

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Thermoelectromagnetic And Other Devices, Thermoelectric And Thermomagnetic Effects

Scientific paper

Calorimetric particle detectors based on metallic paramagnetic temperature sensors have been shown to be well suited for high resolution particle spectroscopy. Most of the work on metallic magnetic calorimeters has been performed using dilute alloys of erbium in gold as the sensor material. In the temperature range of interest, the thermodynamic properties of erbium ions in gold are well understood. The dependence of the signal size is predictable as a function of temperature, magnetic field and concentration. However, at temperatures below 50 mK the decay of the signal exhibits two relaxation times. Measurements of these time constants and the fractional amplitudes as a function of temperature and field indicate the presence of an additional thermodynamic system within the sensor material. Heat capacity measurements at temperatures as low as 100 μK suggest that this additional contribution arises from the quadrupole splitting of the Au nuclei (l=3/2) in the electric field gradients introduced by the presence of the Er ions. Measurements using calorimeters based on silver-erbium sensors support this assumption. In these measurements on Ag the additional, fast relaxation process is not observed. The host material silver (l=1/2) does not have a nuclear electric quadrupole moment. We discuss the origin of the two thermalization times of Au:Er calorimeters and present the measurements on Ag:Er. .

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