Raman spectra of tetragonal YBa2Cu3-xCoxOy which contains oxygen disorder as well as orthorhombic YBa2Cu3Oy and YBa2Cu3-xNixO7 were recorded. With Co doping, a broad band appears at 573 cm-1, the 500 cm-1 band of orthorhombic YBa2Cu3Oy decreases in frequency, and the 115 cm-1 band disappears. The origin of the 573 cm-1 band can be attributed to the infrared active Cu-O stretching mode which becomes Raman active due to the oxygen disorder. The latter two indications are the same as those in the case of oxygen deficient tetragonal phase. Mode patterns of observed Raman bands of orthorhombic YBa2Cu3Oy are also discussed.
ASJC Scopus subject areas
- 化学 (全般)