Optical anisotropy and electron-phonon coupling in Bi2Sr2CaCu2O8 single crystals

✍ Scribed by A. Zibold; M. Dürrler; A. Gaymann; H.P. Geserich; N. Nücker; V.M. Burlakov; P. Müller

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 747 KB
• Volume: 193
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(92)90884-f

✦ Synopsis

We have determined the polarized reflectance spectra Rua, Rib and R~c of the high temperature superconductor Bi2Sr2CaCu208 in the normal state. The photon energy was varied between 30 meV and 6 eV. By fitting a Lorentz-Drude model or by performing a Kramers-Kronig analysis, respectively, the spectral distribution of the tensor components of the real and the imaginary part of the dielectric function were obtained. The optical results reveal a low electrical anisotropy within the (001 ) plane and a very high anisotropy between the in-plane conductivity and the conductivity perpendicular to this plane. The results confirm that Bi2Sr2CaCuzOa is a 2D conductor. The spectrum Rttc gives evidence for the interaction between infrared-active phonons and the low-energy part of interband transitions. From a quantitive fit, based on a Fano-resonance model, a strong electron-phonon coupling is deduced.