FIELD: physics.
SUBSTANCE: offered is superconducting thin-film material (1) including first superconducting thin film (1a) with true surface, and second superconducting thin film (1b) coating true surface of first superconducting thin film (1a). Besides offered is superconducting wire (10) including substrate (2), interlayer (3) formed on this substrate (2), and superconducting layer (4) formed on interlayer (3). Superconducting layer (4) is made of superconducting thin-film material (1) described above. Besides offered are production method of superconducting thin-film material (1) and production method of superconducting wire (10). True surface is produced with mechanical or chemical polishing.
EFFECT: production of high critical current in superconducting thin film and higher degree of critical current increase associated with higher film thickness.
9 cl, 5 dwg, 1 tbl, 2 ex
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