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Phys Rev Lett. 2001 Dec 31;87(27 Pt 1):277001. Epub 2001 Dec 11.

Optical properties of c-axis oriented superconducting MgB2 films.

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Department of Physics, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.


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-Gr√ľneisen 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.

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