The paramagnetic resonance of Gd in single crystals of Pd

Abstract

We report the observation of the resolved fine structure of Gd 3+ in single crystals of Pd. Analysis in terms of the classical theory for the Gd 3+ ion in a cubic crystal field 1 permits us to deduce the crystal field parameter, b 4, to be + 29 ± 2 G. Anomalous temperature dependence of the spectrum of the highest concentration of Gd sample leads us to believe that exchange narrowing processes such as those found recently for Gd in Au 2 may be operative. A discrepancy exists between the values obtained for the exchange constant between the localised moment and conduction electrons deduced from measurements of the local moment g-shift and temperature dependence of the resonance linewidth.