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High-temperature superconducting (HTS) bulk materials of RE–Ba–Cu–O (RE: Y or rare-earth elements) exhibit excellent $J_{c}\!-\!B$ properties, even at 77 K, leading to current leads with large current capacity and superior magnetic field tolerance. The thermal conductivity of HTS bulk materials is two orders of magnitude smaller than that of the conventional current lead material of copper, and Dy–Ba–Cu–O...
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