= High-temperature superconductivity
{wiki}
<High-temperature superconductivity> is a historical name for <superconductivity> above earlier metallic benchmarks. The original <Bednorz-Müller experiment> operated at tens of <kelvins>, requiring deep cooling; <cuprate superconductors> opened a new materials family.<Perovskite-type oxides: The new approach to high-Tc superconductivity by Johannes Georg Bednorz and Karl Alexander Müller>[Part 1, p.426, historical comparison]{ref}
A higher <superconducting transition temperature> enlarges the available operating range, but useful transport also needs a sufficient <superconducting critical current> at the operating <temperature> and <magnetic field>. In a <ceramic>, connections between grains can limit the whole specimen even when individual grains support <superconductivity>. This connects the materials problem to <superconducting weak links> and the <Josephson effect>. The <parallel-path model of a superconducting ceramic> below isolates why connectivity matters.
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