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An ESR Study of YBa2Cu3O7-x and Y2BaCuO5 with Oxygen Deficiencies

ESR spectra of superconducting YBa2Cu3O7-x and insulating Y2BaCuO5 were observed. ESR spectra of YBa2Cu3O7-x were interpreted as the superposition of spectrum A and spectrum B. Spectrum A was observed throughout the whole region of x. It was caused by a small amount of Y2BaCuO5. With an increase in the oxygen deficiency x, spectrum B appeared and increased in intensity. The anisotropy of the g-factor for spectrum B was larger than that for spectrum A. For spectrum A, g// was 2.24 and g⊥ was 2.04.