Abstract
Measurements of Cd nuclear spin lattice relaxation time in CdMn alloys are presented in magnetic fields ranging from 1.4 to 30 kG, and at liquid Helium temperatures. The magnetic impurities contribution is separated into two parts from its field and temperature dependences. Our analysis attributes one to a dipolar relaxation, and the other to a scalar relaxation. An impurity electronic relaxation rate of about 2 x 109 s-1 is deduced from both. In most pure metals, the nuclear spin lattice relaxa- tion is caused by the hyperfine interaction between the nuclei and the conduction electrons. This interac- tion yields the well known Korringa law : a relaxa- tion rate proportional to the temperature and inde- pendent of magnetic field. In this communication, we present an experimental study of the additional nuclear relaxation due to localized electronic spins S in a metal to which paramagnetic impurities have been added. The additional couplings for nuclear relaxa- tion we shall consider in the interpretation of the results are the dipolar and indirect RKKY interactions between nuclei and impurity spins. The former gives rise to a relaxation process well known in insulators. The latter could introduce two distinct processes : (i) a scalar relaxation (we call it BGS (I)) experi- mentally observed (2) in CuMn at very low fields ; this scalar relaxation involves a real excitation of the
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