Optical properties of c-axis oriented superconducting MgB2 films.
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.
Tu
J J
JJ
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA. jtu@bnl.gov
Carr
G L
GL
Perebeinos
V
V
Homes
C C
CC
Strongin
M
M
Allen
P B
PB
Kang
W N
WN
Choi
E M
EM
Kim
H J
HJ
Lee
S I
SI