Abstract
The nuclear spin-spin interaction in several metals (Pt, Pb, Cd) was investigated by spin echo techniques in a magnetic field between 0.05 and 0.30 T. The nuclear spin temperatures T n ranged from 0.4 mK to 30 mK. The T 2 values for Pb and Cd are 330(15) μs and 901(40) μs, respectively. For these metals neither field nor temperature dependence was found. These T 2's are close to those expected from higher temperatures. However, for Pt the spin-spin interaction behaves differently. Not only a field dependence, but also an indication of temperature dependence was found. T 2 was determined for two different samples. At fields above 0.25 T, T 2 was constant and 480(10) μs and 1290(20) μs. At 62 mT, T 2 increased as temperature decreased and reached values of 590(30) μs and 1550(150) μs at T n∼0.6 mK. Conduction electron scattering by impurity moments may be responsible for these observations.
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