Raman scattering from Ba2YCu3O7 above and below the 90-K superconducting transition: Evidence for oxygen vacancies in the Cu-O chains

Z. Iqbal, S. W. Steinhauser, A. Bose, N. Cipollini, H. Eckhardt

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Abstract

Raman scattering data from different types of samples of the normal and superconducting phases of Ba2YCu3O7 (Tc90 K) and Ba2Y0.75Sc0.25 Cu2.4Ni0.6+2O7 (Tc 65 K) are reported and assigned. A Raman line observed at 632 cm-1 is assigned to the stretching mode of the Cu-O chains. This mode is Raman inactive in the ordered O-deficient lattice but appears to be activated by oxygen vacancies along the chains. Another sample-dependent line is observed at 365 cm-1 which gains intensity below 150 K but disappears in the superconducting phase. In the Ni-alloyed material the Raman results suggest that the Ni2+ ions primarily occupy Cu sites in the Cu-O chains.

Original languageEnglish (US)
Pages (from-to)2283-2286
Number of pages4
JournalPhysical Review B
Volume36
Issue number4
DOIs
StatePublished - 1987

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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