1. C-axis infrared spectra of bilayer high Tc cuprates
- Author
-
Zelezny, V., Tajima, S., Motohashi, T., Shimoyama, J., Kishio, K., van der Marel, D., Yamashita, T., Tanabe, K., and Optische Fysica van de Gecondenseerde Materie
- Subjects
Superfluidity ,Materials science ,Condensed matter physics ,Phonon ,Condensed Matter::Superconductivity ,Bilayer ,Physics::Optics ,Infrared spectroscopy ,Cuprate ,Conductivity ,Optical conductivity ,Plasmon - Abstract
The c-axis optical spectra of single crystals of YBa2(Cu1-xRx)3O6.6, R=Ni and Zn, and Bi2Sr2CaCu2O8+δ have been measured at temperatures between 7 and 300 K. The complex conductivity shows several interesting features known from pure YBCO — an anomalous interaction of optical phonons with the electronic background and appearance of a bump at 420 cm-1. It was found that these features are present in the conductivity spectra of all bilayer high-Tc cuprates. The observed bump can be interpreted as an intrabilayer plasmon predicted by the multilayer model, which strongly interacts with optical phonons. The concentration dependence of the optical conductivity shows that the primary parameter, which determines the intensity of the mentioned effect, is the critical temperature (Tc) or superfluid density.
- Published
- 2000