1988 年 57 巻 5 号 p. 1554-1557
Superconducting fluctuation-induced diamagnetism was observed in YBa2Cu3O7−δ with different oxygen deficiencies. In a slightly deficient sample, the fluctuation is small and exhibits the temperature dependence of a three-dimensional nature. With increasing defects, however, the fluctuations were found to be enhanced and exhibit a crossover from three- to two-dimensional behaviors at higher temperatures. The dimensionality, which is controlled by the interlayer coupling between the CuO2 planes, is very sensitive to oxygen deficiency in the CuO chains, even when the critical temperature remains around 90 K.
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