Size Effect of Metallic Fine Particle of Cu

Abstract

The NMR line shape, relaxation time and the static susceptibility of metallic Cu fine particles (∼50Å) are measured at liquid He temperatures. The line shape shows an enhanced spin paramagnetism which can be explained as anomalies due to finite spacing of the electron energy levels with strong 1-s coupling. The spin-lattice relaxation time is shorter than bulk value, contrary to expectations.