Substitution for copper in a high-Tc superconductor YBa 2Cu3O7-δ

Yoshiteru Maeno, Tsukasa Tomita, Makoto Kyogoku, Satoshi Awaji, Yuji Aoki, Kenichi Hoshino, Asao Minami, Toshizo Fujita

Research output: Contribution to journalArticlepeer-review

357 Citations (Scopus)


In spite of an overwhelming amount of research work1 triggered by the discovery2 of superconductivity above 90 K in an Y-Ba-Cu oxide, fundamental questions regarding the origin and mechanism of the high-Tc superconductivity in YBa2Cu3O 7-δ remain to be answered. Specifically, it has not been decided which of the two Cu sites mainly carries superconducting electrons. As an approach to the problem, we investigated superconductivity in a series of alloyed compounds, YBa2 (Cu1-xMx) 3O7-δ with M = Fe, Co, Ni, Zn and Ga, in which metals M are partially substituted for Cu. The electrical resistivity measurements, as well as the X-ray analysis at low temperatures, show that Tc is not sensitive to the orthorhombic-tetragonal phase transition induced by the impurities, thus strongly suggesting that superconductivity along the one-dimensional Cu-O chains is unlikely.

Original languageEnglish
Pages (from-to)512-514
Number of pages3
Issue number6130
Publication statusPublished - 1987 Jan 1
Externally publishedYes

ASJC Scopus subject areas

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