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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Abstract

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
Volume50
Issue number5
DOIs
Publication statusPublished - 1994

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Spin fluctuations
Paramagnetic resonance
electron paramagnetic resonance
Substitution reactions
retarding
substitutes
Atoms
Superconducting materials
atoms
magnetic permeability
nuclear magnetic resonance
shift
Temperature

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

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

In: Physical Review B, Vol. 50, No. 5, 1994, p. 3442-3445.

Research output: Contribution to journalArticle

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abstract = "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.",
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