Abstract
Temperature dependent optical conductivities and dc resistivity of c-axis oriented superconducting ( ) films ( ) have been measured. The normal state ab-plane optical conductivities can be described by the Drude model with a temperature independent Drude plasma frequency of or . The normal state resistivity is fitted by the Bloch-Grüneisen formula with an electron-phonon coupling constant . The optical conductivity spectra below of these films suggest that is a multigap superconductor.
- Received 2 July 2001
DOI:https://doi.org/10.1103/PhysRevLett.87.277001
©2001 American Physical Society