Calibration and applications of polarized neutron thermometry at milli- and microkelvin temperatures

The polarized neutron scattering technique was used for the determination of the nuclear temperature in Cu from 20 mK down to 100 mu K. Using a cooling facility where two adiabatic demagnetization stages work in series the flipping ratio of neutrons scattered from the (200) Bragg-peak was calibrated...

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Bibliographic Details
Published in:Zeitschrift f r Physik B Condensed Matter 1988-06, Vol.71 (2), p.139-148
Main Authors: Jyrkki, T. A., Huiku, M. T., Clausen, K. N., Siemensmeyer, K., Kakurai, K., Steiner, M.
Format: Article
Language:English
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Summary:The polarized neutron scattering technique was used for the determination of the nuclear temperature in Cu from 20 mK down to 100 mu K. Using a cooling facility where two adiabatic demagnetization stages work in series the flipping ratio of neutrons scattered from the (200) Bragg-peak was calibrated against the nuclear polarization over the whole polarization range. The observed calibration curve deviates considerably from the curve expected for an extinction-free sample. The polarized neutron thermometer is discussed and applied in measurements of the spin--lattice relaxation in Cu. 17 ref.--AA
ISSN:0722-3277
1434-6036
DOI:10.1007/BF01312783