ESR STUDIES ON GMR RELATED MATERIALS III: ESR OF Mn IN La0.9Ca0.1MnO3

Abstract

ESR measurements have been done on La 0.9 Ca 0.1 MnO 3 from 4 K up to about 760 K. Two kinds of spectra (the high- and low-field signals) are observed below about 220 K, and clear signals above ≃233 K . The ESR linewidth, ΔH PP , of the high-field signal with g≃2 is nearly proportional to temperature times magnetic moment. The ESR intensity becomes maximum at around 233 K. Above 300 K, ΔH PP is nearly proportional to exp (-600/T), and the intensity follows Curie's law above 600 K, but gradually deviates upward from it with decreasing temperature below about 600 K, presumably due to the "spin-cluster" formation.