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Superconducting Materials

Highly oriented oxide superconductor films are fabricated by a dipping-pyrolysis process using metal-organic compounds as starting materials. Epitaxial YBa2Cu3O7-y(YBCO) films prepared by two-step annealing give high critical current densities at 77K: 1.2x 106A/cm2 in zero-applied fields, and 1.0x105A/cm2 in a magnetic field of 8T. These values are comparable to those of the YBCO films prepared by in situ deposition processes such as sputtering and chemical vapor deposition.

High-temperature oxide superconductors and related materials are synthesized and their crystal structures and physical properties are evaluated. The figure shows the crystal structure of the Cu-based superconductor Cu1-xBa2Ca3Cu4O12-y(transition temperature of 117K): determined by single crystal x-ray structure analysis method for the first time.


Crystal structure of Cul-xBa2Ca3Cu4O12-y

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