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VOLUME 49 (1989) | ISSUE 1 | PAGE 61
Observation of superconductivity in a bromine- and iodine-doped Y-Ba-Cu-O ceramic
A transition to a superconducting (diamagnetic) state has been observed in nonsuperconducting tetragonal samples of a YBa2Cu30(1 { ceramic heat-treated with gaseous bromine or iodine. The transition begins at Tti) ~ 75 К or T<i} ~ 50 K, respectively.