Thomas E. Karis, C. Mark Seymour, et al.
Rheologica Acta
We present polarized Raman measurements of small single crystals embedded in Y1-xEuxBa2Cu3O7 polycrystalline pellets. Superconductivity remains unsuppressed through the entire range of x. With increasing x, the frequency increase of the Ba-Ba vibrational mode and the apical oxygen Oz-Oz vibrational mode, is significantly smaller than in Y1-xPrxBa2 Cu3O7, even though similar changes in interatomic distances occur in both systems. These results support the assertion that the frequency changes of Ba-Ba and Oz-Oz modes are due to changes in electronic states and not due to interatomic distances. © 1990.
Thomas E. Karis, C. Mark Seymour, et al.
Rheologica Acta
A. Gangulee, F.M. D'Heurle
Thin Solid Films
R. Ghez, M.B. Small
JES
Frank Stem
C R C Critical Reviews in Solid State Sciences