Phonon characterization ofYBa2(Cu1−x

Abstract

We present new Raman scattering data on high-temperature superconducting materials with composition YBa2(Cui -"Al")307 q. In YBa2Cu307 q we observe new high-frequency peaks greater than 700 cm ' that we associate with two-phonon interactions of the erst-order Cu -0 Raman vibrations that occur at 337, (450 10), and 502 cm '. The intensity of these new 36 8315

Electronic Conduction in Oxides

“…The temperature coefficient 1 is about 18 mJ /mol K 2 at 280 K for x > 0.92, which is as small as the band structure value 13 mJ /molK 2 [1128], and barely temperature-dependent. The Raman spectra of a single crystal YBCO has been investigated [1129][1130][1131][1132]. e) Phonons.…”