| 摘要 |
Proposed are a selective reduction type high temperature superconductor and methods of making the same, the superconductor having a pair of charge supply layers each formed of a Cu1-xMx surface (1, 1), a first superconducting layer formed of a 5-coordination CuO2 surface (2) and a second superconducting layer formed of a 4-coordination CuO2 surface (3). Reducing M ions (e.g., Tl ions) in the charge supply layers by heat treatment in a reducing atmosphere enables the 5-coordination CuO2 surface (2) as the first superconducting layer to be over-doped and the 4-coordination CuO2 surface (3) as the second superconducting layer to be optimum-doped. According to the present invention, a high temperature superconductor is provided that with its critical temperature held high has a reduced superconducting anisotropy gamma, and provides a high critical current density Jc and a high c irreversibility field Hirr.
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