Absence of metallic character at certain Cu sites in YBa2Cu3O6.7

W. W. Warren, R. E. Walstedt, G. F. Brennert, R. J. Cava, B. Batlogg, L. W. Rupp

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Abstract

We report Cu63 nuclear-quadrupolar-resonance spectra and nuclear-spin relaxation data for the oxygen-deficient phase YBa2Cu3O6.7. Compared with YBa2Cu3O7.0, the spin-lattice relaxation rates are reduced by more than three orders of magnitude for a class of sites identified as nonmetallic Cu(1) "chain" sites with twofold oxygen coordination. Generation of these 3d10 Cu+ sites by ordering of oxygen vacancies onto "empty" chains increases the carrier concentration and may help maintain the observed 60-K plateau in the variation of Tc with oxygen concentration.

Original languageEnglish (US)
Pages (from-to)831-834
Number of pages4
JournalPhysical Review B
Volume39
Issue number1
DOIs
StatePublished - Jan 1 1989
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Warren, W. W., Walstedt, R. E., Brennert, G. F., Cava, R. J., Batlogg, B., & Rupp, L. W. (1989). Absence of metallic character at certain Cu sites in YBa2Cu3O6.7. Physical Review B, 39(1), 831-834. https://doi.org/10.1103/PhysRevB.39.831