Abstract
Magnetism of YBa 2Cu 3O 7−x with various oxygen deficiency has been investigated by static susceptibility and electron paramagnetic resonance (EPR) measurements. The susceptibility of the samples in the orthorhombic phase (0 < x < 0.44) was found to vary systematically with the oxygen deficiency, without any low-temperature upturn. Near T c, superconducting fluctuation-induced diamagnetism was observed. Its temperature dependence revealed a three-dimensional nature of the fluctuations for a sample with x = 0 and a crossover from three- to two-dimensional behaviors for deficient samples. EPR signal from the electrons free from superconducting condensation was detected. The anomalous temperature dependence of spin susceptibility for this signal is discussed in connection with the electron localization induced by the randomness of the oxygen nonstoichiometry.
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