Suppression of the superconducting gap and the spin-fluctuation gap of YBa2Cu3Oy (y=7.0 and 6.76) by Zn substitution as measured by Gd3+ electron-spin resonance

A. Jánossy, J. R. Cooper, L. C. Brunel, A. Carrington

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The local susceptibility around Zn atoms in Gd-doped YBa2(Cu0.97Zn0.03)3Oy has been measured by the electron-spin-resonance Knight shift of Gd3+ at 245 GHz. The magnitude and distribution of the shifts are compared with the corresponding data for compounds with no Zn. For both y=7.0 and 6.76 the full density of states (corresponding to the high-temperature normal state of the pure y=7.0 compound) is restored at the first-neighbor sites of Zn atoms irrespective of whether the material is superconducting or not. This shows that both the superconducting gap and the spin-fluctuation gap are locally suppressed by Zn substitution.

Original languageEnglish
Pages (from-to)3442-3445
Number of pages4
JournalPhysical Review B
Issue number5
Publication statusPublished - Jan 1 1994


ASJC Scopus subject areas

  • Condensed Matter Physics

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