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

doi:10.1016/0038-1098(91)90170-Z

Effect of oxygen disorder on superconductivity-induced self-energy effects in impurity-free YBa₂Cu₃O_7-δ

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

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Abstract

We investigated various areas of impurity-free YBa₂Cu₃O_7-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 B_1g-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/kT_c 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.

Original language	English
Pages (from-to)	643-647
Number of pages	5
Journal	Solid State Communications
Volume	80
Issue number	8
DOIs	https://doi.org/10.1016/0038-1098(91)90170-Z
Publication status	Published - 1991 Nov
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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

abstract = "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.",

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T1 - Effect of oxygen disorder on superconductivity-induced self-energy effects in impurity-free YBa2Cu3O7-δ

AU - Hadjiev, V. G.

AU - Thomsrn, C.

AU - Erb, A.

AU - Müller-Vogt, G.

AU - Koblischka, M. R.

AU - Cardona, M.

PY - 1991/11

Y1 - 1991/11

N2 - 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.

AB - 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.

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Effect of oxygen disorder on superconductivity-induced self-energy effects in impurity-free YBa₂Cu₃O_7-δ

Abstract

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