Abstract
Nuclear magnetic resonance, ac susceptibility, and nuclear heat capacity ofPt samples with different concentrations of magnetic impurities x in the ppmrange have been studied at magnetic fields (0 ± 0.05) mT ⩽ B⩽248 mT and at temperatures 0.3 μK ⩽ T⩽100 mK.Spin-lattice and spin-spin relaxation times of 195Pt stronglydepend on the impurity content x, and the nuclear heat capacity data showenhanced values which scale with x at low polarization of the nuclear spinsystem. We present a model to describe the heat capacity data with a spatiallyvarying internal field caused by the magnetic impurities. There is noindication for a nuclear magnetic ordering of195Pt to a nuclear temperature of Tn = 0.3 μK andan electronic temperature of Tel = 1.5 μK.
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