We have investigated at ultralow temperatures the spin-lattice relaxation in rhodium samples with about 10p.p.m. of iron impurities. A strong decrease in the Korringa constant K, dependent on the sign of the nuclear spin temperature T, was observed below 1 mT. Our data on the spin-lattice relaxation time T ~, , measured at the electronic temperature T, = 120 pK, fit the equation l / z ll/(xo/T,) = l/r;"P(B, T), where the impurity term @(B, T ) has a contribution proportional to the inverse nuclear spin temperature in small fields.
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