Abstract
The EPR spectra of the oxygen-deficient La0.5Yb0.5Ba2Cu3O y mixed phase has been investigated as a function of temperature. At low temperatures (T < 15 K), an intense EPR line indicating the presence of magnetic clusters associated with spin-polarized clusters of copper ions through delocalized oxygen holes, has been detected. Both the EPR linewidth and g-factor of the latter EPR spectrum exhibit strong temperature dependence indicative of short-range order effects. At higher temperatures (T > 30 K), the EPR spectrum reveal the contribution of Cu2+ defects and a broad EPR spectrum due to Yb3+ ions which is compared with the corresponding one in La0.5Yb0.5Ba2Cu3O y Y0.5Yb0.5Ba2Cu3O y compounds.
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