title: Optical properties of c-axis oriented superconducting MgB2 films.
abstract: Temperature dependent optical conductivities and dc resistivity of c-axis oriented superconducting (T(c) = 39.6 K) MgB2 films (approximately 450 nm) 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-Grüneisen 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.
authors.affiliation: Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. jtu@bnl.gov
authors.forename: J J
authors.initials: JJ
authors.lastname: Tu
authors.forename: G L
authors.initials: GL
authors.lastname: Carr
authors.forename: V
authors.initials: V
authors.lastname: Perebeinos
authors.forename: C C
authors.initials: CC
authors.lastname: Homes
authors.forename: M
authors.initials: M
authors.lastname: Strongin
authors.forename: P B
authors.initials: PB
authors.lastname: Allen
authors.forename: W N
authors.initials: WN
authors.lastname: Kang
authors.forename: E M
authors.initials: EM
authors.lastname: Choi
authors.forename: H J
authors.initials: HJ
authors.lastname: Kim
authors.forename: S I
authors.initials: SI
authors.lastname: Lee