Optical Properties of Bi-Sr-Ca-Cu-O Thin Films

Abstract

The optical reflectivity and absorption spectra for the Bi2Sr2Can-1CunOx systems (n=1, 2 and 3) were measured at room temperature using c-axis-orientated films. In the reflectivity spectra, the increase of n enhanced a Drude-like reflection and shifted its plasma edge to the shorter-wavelength region. In the absorption spectra, a near-infrared absorption was enhanced with increasing n, contrasting with an insulating Bi2Sr2NdCu2Ox film where an interband absorption in the visible region was dominant. These features should reflect the electronic structure which gives rise to the superconductivity.