Role of bond lengths in the 90-K superconductor: A neutron powder-diffraction study of YBa2Cu3-xCoxO7-y

P. F. Miceli, J. M. Tarascon, Laura Greene, P. Barboux, F. J. Rotella, J. D. Jorgensen

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of a neutron powder-diffraction study on YBa2Cu3-xCoxO7-y. We find that Co preferentially occupies the Cu(1) site, simultaneously attracting extra oxygen into these layers in an amount consistent with Co(III) replacing Cu(II). This compound displays a transition from orthorhombic-to-tetragonal structure for x between 0.05 and 0.1, while Tc decreases continuously and the compound becomes nonsuperconducting for x=0.4. We note several important relationships between bond-length changes, which reflect charge transfer among the ions. Also, we find that Tc changes systematically with the Cu-O bond length.

Original languageEnglish (US)
Pages (from-to)5932-5935
Number of pages4
JournalPhysical Review B
Volume37
Issue number10
DOIs
StatePublished - Jan 1 1988

ASJC Scopus subject areas

  • Condensed Matter Physics

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