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Calibration and applications of polarized neutron thermometry at milli- and microkelvin temperatures |
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| Authors: | T. A. Jyrkkiö M. T. Huiku K. N. Clausen K. Siemensmeyer K. Kakurai M. Steiner |
| Affiliation: | (1) Low Temperature Laboratory, Helsinki University of Technology, SF-02150 Espoo, Finland;(2) Present address: Physics Department, Risø National Laboratory, P.O. Box 49, DK-4000 Roskilde, Denmark;(3) Hahn-Meitner-Institut, Glienicker Strasse 100, D-1000 Berlin, Germany |
| Abstract: | We have utilized the polarized neutron scattering technique for the determination of the nuclear temperature in copper from 20 mK down to 100  K. 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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