Phonon Raman scattering and structure of Co substituted YBa2Cu3O6+δ

✍ Scribed by M. Kakihana; L. Börjesson; L.M. Torell; S.G. Eriksson

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 144 KB
• Volume: 162-164
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(89)90675-8

✦ Synopsis

Raman and x-ray diffraction measurements have been performed on Co substituted YBa2Cu3-xCoxO6+8. The x-ray diffraction data show that the structure transforms from orthorhombic to tetragonal at x=0.13. The features in the Raman spectra change smoothly throughout the investigated concentration range without any observable abrupt changes at the phase transition. The observed changes in the Ran'tan spectra for increasing Co concentration are reminiscent of those observed for pure YBCO samples of increasing oxygen deficiency. In particular, the frequency of the 0(4) slretching vibration is observed to be simil~ly correlated to T e for both Co substituted and oxygen deficient YBCO. k is suggested that the 0(4) stretching vibration is sensitive to small changes of the charge balance between the ChK) chains and the CuO2 planes.