Complex Susceptibility of YBa2Cu3O6.86

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Abstract
The superconducting transition of YBa2Cu3O6.86 has been studied in terms of complex susceptibility. It is found that the transition has two phases. One is insensitive to the change in the amplitude, h 0 (5-1000 mOe), of the external ac field. The other is very sensitive to h 0, where the transition width is appreciably broadened as h 0 increases. No frequency dependence is found below 320 Hz. These behaviors are qualitatively common to the other oxide superconductors, La1.9Sr0.1CuO4-x and ErBa2Cu3O6+x . Discussion is made in the framework of the phenomenological weak-link loop model.

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