Nuclear magnetic resonance in dilute magnetic alloys and superconductors

Abstract

The longitudinal and transverse spin-lattice relaxation rates for paramagnetic ion-nuclei in dilute Kondo systems are calculated. It is shown that obsevation of the Kondo anomalies in the NMR parameters is facilitated by either high temperatures (kT >> ωs, the resonance frequency for localized moments) for low temperatures (kT < <ωs). The longitudinal spin-lattice relaxation of paramagnetic ion-nuclei in "dirty" type II superconductors is investigated. The influence of the order parameter fluctuations on relaxation of paramagnetic ion-nuclei in type II superconductors is studied at temperatures slightly above the transition temperature Tc. © 1991.