Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd

Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes

G. A. Kourouklis, A. Jayaraman, B. Batlogg, R. J. Cava, M. Stavola, D. M. Krol, E. A. Rietman, Lynn Schneemeyer

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Abstract

We have studied the Cu-O vibrations in the MBa2Cu3O7 systems with M=Y,Eu,andGd by Raman spectroscopy. The observed Raman features are similar in the three systems. The four Raman bands in the 300-700 cm-1 frequency region exhibit isotopic shifts upon O18 substitution implying that these modes involve oxygen vibrations. In oxygen-deficient YBa2Cu3O7- samples prepared in the range 0< <0.7 within the orthorhombic structure, the A1g axial stretch mode is found to undergo both a softening and broadening with increasing oxygen deficiency. Furthermore, the Raman feature in the 550-600 cm-1 region shows an increase in intensity. The latter is attributed to disorder activation of the Cu-O chain mode, normally forbidden in the stoichiometric compound. These features and the emergence of a distinct Raman peak near 390 cm-1 in oxygen-deficient samples suggest that Raman spectroscopy could be used for characterizing oxygen stoichiometry of high-Tc superconductors.

Original languageEnglish
Pages (from-to)8320-8324
Number of pages5
JournalPhysical Review B
Volume36
Issue number16
DOIs
StatePublished - 1 Jan 1987

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Oxygen vacancies
Raman scattering
vibration mode
Substitution reactions
substitutes
Raman spectra
Oxygen
oxygen
Raman spectroscopy
vibration
hypoxia
softening
stoichiometry
Stoichiometry
Superconducting materials
activation
disorders
Chemical activation
shift

Cite this

Kourouklis, G. A. ; Jayaraman, A. ; Batlogg, B. ; Cava, R. J. ; Stavola, M. ; Krol, D. M. ; Rietman, E. A. ; Schneemeyer, Lynn. / Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd : Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes. In: Physical Review B. 1987 ; Vol. 36, No. 16. pp. 8320-8324.
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abstract = "We have studied the Cu-O vibrations in the MBa2Cu3O7 systems with M=Y,Eu,andGd by Raman spectroscopy. The observed Raman features are similar in the three systems. The four Raman bands in the 300-700 cm-1 frequency region exhibit isotopic shifts upon O18 substitution implying that these modes involve oxygen vibrations. In oxygen-deficient YBa2Cu3O7- samples prepared in the range 0< <0.7 within the orthorhombic structure, the A1g axial stretch mode is found to undergo both a softening and broadening with increasing oxygen deficiency. Furthermore, the Raman feature in the 550-600 cm-1 region shows an increase in intensity. The latter is attributed to disorder activation of the Cu-O chain mode, normally forbidden in the stoichiometric compound. These features and the emergence of a distinct Raman peak near 390 cm-1 in oxygen-deficient samples suggest that Raman spectroscopy could be used for characterizing oxygen stoichiometry of high-Tc superconductors.",
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Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd : Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes. / Kourouklis, G. A.; Jayaraman, A.; Batlogg, B.; Cava, R. J.; Stavola, M.; Krol, D. M.; Rietman, E. A.; Schneemeyer, Lynn.

In: Physical Review B, Vol. 36, No. 16, 01.01.1987, p. 8320-8324.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Kourouklis, G. A.

AU - Jayaraman, A.

AU - Batlogg, B.

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AU - Schneemeyer, Lynn

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