Abstract
In order to study the change in magnetic and electronic properties of the CuO 2-plane in YBa 2Cu 3O y due to hole-doping, Er 3+-EPR measurements have been performed on Er-doped YBa 2Cu 3O y (6< y<7) compounds. It has been obtained that the EPR-linewidth of Er 3+-spin embedded in Y-site consists of residual linewidth and linewidths responsible for the Korringa and the Orbach relaxation processes. Analysis of the linewidth due to the Korringa process indicates that the number of conduction carriers in the CuO 2-plane saturates in y>6.4 and does not show any anomaly around y=6.7, where it is well known as the boundary for the 60 K plateau in T c. From the analysis of linewidth due to the Orbach process, we have obtained that the strength of orbit–lattice coupling of Er 3+-spin changes noticeably around y=6.7. Magnetic and electronic properties of the CuO 2-plane and the 60 K plateau have been investigated by using these analytical results.
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