Abstract
We have utilized the spin-dependent neutron-nucleus interaction to measure the nuclear polarization in a single crystal of109Ag. Transmission measurements with a polarized neutron beam in a high magnetic field provided a convenient primary thermometer. By this method the spin-lattice relaxation of109Ag was studied at low electronic temperatures (<200 μK) and high magnetic fields (7 T), where the Korringa relation breaks down. At lower magnetic fields we used the transmission method with unpolarized neutrons. By this method we studied the nuclear polarization and susceptibility within the nuclear antiferromagnetically ordered state at picokelvin temperatures.
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