Effect of oxygen disorder on superconductivity-induced self-energy effects in impurity-free YBa2Cu3O7-δ

V. G. Hadjiev, C. Thomsrn, A. Erb, G. Müller-Vogt, M. R. Koblischka, M. Cardona

研究成果: Article査読

49 被引用数 (Scopus)

抄録

We investigated various areas of impurity-free YBa2Cu3O7-δ single crystals with Raman spectroscopy. A definite correlation between the appearance of the group- theoretically forbidden chain-related Raman lines at 232 and 598 cm-1 and the superconductivity-induced self-energy effects observed for the 340 cm-1 B1g-like mode was established: Disorder in the chains in pure crystals has a similar effect as the introduction of impurity atoms, both leading to an increased gap value for 2Δ/kTc as deduced from the phonon self-energy effects. The absence of the forbidden chain modes in the Raman spectra may be used as an extremely sensitive quality criterion of impurity-free crystals.

本文言語English
ページ(範囲)643-647
ページ数5
ジャーナルSolid State Communications
80
8
DOI
出版ステータスPublished - 1991 11
外部発表はい

ASJC Scopus subject areas

  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

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