Physics – Condensed Matter
Scientific paper
1994-06-27
Physica C 229 (1994), 396
Physics
Condensed Matter
6 pages, figures on request. Revtex, version 2, Materials Science Center Internal Report Number VSGD.93.12.th
Scientific paper
10.1016/0921-4534(94)90523-1
We use the experimental technique of thermal modulation reflectometry to study the relatively small temperature dependence of the optical conductivity of superconductors. Due to a large cancellation of systematic errors, this technique is shown to a be very sensitive probe of small changes in reflectivity. We analyze thermal modulation reflection spectra of single crystals and epitaxially grown thin films of YBa$_2$Cu$_3$O$_{7-\delta}$ and obtain the ${\alpha_tr}^2F(\omega)$ function in the normal state, as well as the superconductivity induced changes in reflectivity. We present detailed model calculations, based on the Eliashberg-Migdal extension of the BCS model, which show good qualitative and quantitative agreement with the experimental spectra. VSGD.93.12.th
der Marel Dirk van
Dolgov Oleg V.
Feenstra B. J.
Karakozov A. E.
Mikhailovsky A. A.
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