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'Hot' superconductor surprise baffles physicists

发布时间:2019-02-28 02:12:02来源:未知点击:

By Amarendra Swarup FOR years physicists have seemed tantalisingly close to explaining high-temperature superconductivity. But the observation of one of its defining properties in an unexpected material, a magnetic metal, has left them wondering if they understand this exotic phenomenon at all. Superconductivity usually occurs in metals at temperatures close to absolute zero. Quantum effects at these temperatures cause electrons to stop repelling each other and pair up, reducing the material’s electrical resistance to zero. Photons fired at the material can break up the electron pairs,