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Strongly overdoped samples of the three-CuO 2 -plane copper-oxide superconductor, CuBa 2 Ca 2 Cu 3 O 8+z or Cu-1223, were obtained through high-pressure synthesis and post-annealed to various hole-doping levels so as to have the value of T c range from 65 to 118K. A concomitant decrease in the average valence of copper from ~2.20 to ~2.05 was...
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