Abstract
We have utilized the polarized neutron scattering technique for the determination of the nuclear temperature in copper from 20 mK down to 100 μK. Using a cooling facility where two adiabatic demagnetization stages work in series we have calibrated the flipping ratio of neutrons scattered from the (200) Bragg-peak 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 copper.
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Jyrkkiö, T.A., Huiku, M.T., Clausen, K.N. et al. Calibration and applications of polarized neutron thermometry at milli- and microkelvin temperatures. Z. Physik B - Condensed Matter 71, 139–148 (1988). https://doi.org/10.1007/BF01312783
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DOI: https://doi.org/10.1007/BF01312783