In the Raman spectra measured on YBa2Cu3O7 single crystals there are continua of electronic origin. It is proposed that in addition to the intraband scattering there is an interband contribution due to the charge transfer between the bridging oxygen and the plane, which is strongly coupled to the 330-cm-1 phonon. We suggest that the entirely gapless feature of the spectra with B1g symmetry is a probe of nodes in the superconducting gap. The compatible d- and p-pairing states are listed.
ASJC Scopus subject areas
- Physics and Astronomy(all)