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YBa 2 Cu 4 O 8 is a stoichiometric oxide superconductor of T c ∼80K. Unlike YBa 2 Cu 3 O 7−δ , this compound is free from oxygen vacancy or twin formation and does not have any microscopic disorder in the crystal. Doping with Ca raises its T c to 90K. The compound is a promising superconductor for technological application. Up to...
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