Observation of superconductivity in PrBa2Cu3O7

Abstract
Inhomogeneous superconductivity in PrBa2 Cu3 O7 at ≈92 K is observed in surface resistance measurements (at microwave frequencies) and in diamagnetism (Meissner effect) detected by ESR of trace amounts of Cu impurity spins. These observations are interpreted in terms of the oxygen model.