Electron spin-lattice relaxation of Er3+-ions in Y0.99Er0.01Ba2Cu3Ox

The temperature dependence of the electron spin-lattice relaxation (SLR) was studied in Y0.99Er0.01Ba2Cu3Ox(0 ≤ x ≤ 7). The data derived from the electron spin resonance (ESR) and SLR measurements were compared to those from inelastic neutron scattering studies. SLR of Er3+-ions in the temperature range from 20 K to 65 K can be explained by the resonant phonon relaxation process with the involvement of the lowest excited crystalline-electric-field electronic states of Er3+. These results are consistent with a local phase separation effects. Possible mechanisms of the ESR line broadening at lower temperatures are discussed. © 1998 Elsevier Science B.V. All rights reserved