MAGNETIC-PROPERTIES OF ND3+ PHOSPHATE-GLASSES

AC susceptibility and P-31 NMR measurement on Nd3+ phosphate glasses h ave been made over a wide range of temperature. The AC susceptibility results follow the Curie-Weiss law. The temperature dependence of the nuclear spin-lattice relaxation time (T1) is understood in terms of an Orbach process involving the Nd3+ impurities. The activation energies obtained for this process agree with previously estimated crystal fie ld interactions. The P-31 absorption lines broaden with decreasing tem perature, indicating that the nuclear spins experience a larger freque ncy distribution at low temperatures.