Optical properties of c-axis oriented superconducting MgB2 films -: art. no. 277001

Temperature dependent optical conductivities and dc resistivity of c-axis oriented superconducting (T-c = 39.6 K) X1,02 films (similar to 450 mn) 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 omega (p,D) = 13 600 +/- 100 cm(-1) or 1.68 +/-0.01 eV. The normal state resistivity is fitted by the Bloch-Gruneisen formula with an electron-phonon coupling constant lambda (tr) = 0.13 +/-0.02. The optical conductivity spectra below T-c of these films suggest that MgB2 is a multigap superconductor.