W. König

TL;DR: In this paper, the variation of Raman and infrared spectra of the new high T c superconductors with oxygen content was studied and it was shown that the Raman peaks associated with Cu-O stretching vibration (502 cm −1, x=0) and Ba-O vibrations (154 cm − 1, x = 0) decrease in frequency when oxygen is removed.

TL;DR: In this article, the far-infrared reflectance of Y 1− x Pr x Ba 2 Cu 3 O 7 thin films was measured and the experimental frequencies of the in-plane and z-polarized infrared-active phonons of PrBa 2 Cu3 O 7 were obtained.

TL;DR: In this paper, the authors reported far-infrared and Raman studies of several ceramic superconducting cuprate perovskites MBa 2 Cu 3 O 7 with M=Nd, Dy, Er, Tm.

TL;DR: In this paper, the same authors report both Raman and infrared results on the same semiconducting YBa2Cu3O7-x material and find that splittings of the modes due to lowering the symmetry from tetragonal to the superconducting orthorhombic phase are not observed; no frequency renormalizations, of the type that have been discussed theoretically, are observed.

TL;DR: In this article, it was shown that the anomalous temperature dependence of the ∼340 cm-1 Raman phonons of YBa2Cu3O7-δ is common to many materials of the family (M = Y, Sm, Eu, Ho, Gd), and the ir-active Davidov counterpart of this phonon, and another iractive phonon at slightly lower frequency, also exhibit similar effects.