Superconductivity in Rapidly Cooled Gd3Ba3Cu4Oz
Recently Bednorz and Mueller  initiated an almost explosive growth in the field of superconductivity by detecting indications that in the quaternary mixed-valence system LaxBa2−xCuO4−y superconductivity with critical temperatures Tc in excess of 30 K could be achieved. Since the previous record-holder was Nb3Ge at 23.3 K, the report generated immense interest, and within a few months it was found in laboratories around the world that there were several compounds with critical temperatures in the 90–100 K range, i.e. well above the boiling temperature of liquid nitrogen [2–7].
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