The materials used in this study are a (perpendicular) or c (perpendicular) oriented thin films of Y(Pr)Ba₂Cu₃O_6+(delta ) with thickness of 1400 angstrom to 3000 angstrom. The temperature dependence of the Raman spectrum of YBa₂Cu₃O_6.9 (YBCO) is presented using the excitation wavelength at 676.4 nm (red line). At 10 K all phonons exhibit Fano asymmetries. The phonon frequency and the linewidth of the bands at 335 and 449 cm^-1 show anomalous temperature dependence in the vicinity of T_c. Thin films with oxygen stoichiometry near to (delta) equals 0.9 are then investigated. Correlation is made between the appearance of strong Raman features at 230 and 596 cm^-1 and the oxygen disorder of the films.

Date Published: 10 June 1996
PDF: 12 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241804

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)