Experimental studies of the high-temperature superconducting cuprates using thermal difference reflectance spectroscopy

Catherine L. Perry; Matthew J. Holcomb; James P. Collman; William A. Little

doi:10.1117/12.241808

10 June 1996 Experimental studies of the high-temperature superconducting cuprates using thermal difference reflectance spectroscopy

Catherine L. Perry, Matthew J. Holcomb, James P. Collman, William A. Little

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241808
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

We have previously measured the temperature dependent thermal difference reflectance (TDR) spectra of several high-temperature superconducting thin films. From the TDR spectra collected above and below the critical temperature of each sample, the superconducting to normal state reflectance ratio, R_SR_N, has been obtained. We observe significant deviations from unity in this reflectance ratio at photon energies on the order of 2.0 eV. Both the temperature dependence and location of this structure in the R_S/R_N spectra may be described by solving the Eliashberg integral equations with an electron-boson coupling function that includes both an electron-phonon interaction and an interaction located at approximately the energies of known charge transfer excitations in these materials (approximately 2.0 eV). We found remarkably good agreement between the experimental data and the results of our calculations based upon this description of the superconducting state. We also use the technique of TDR spectroscopy to probe the superconducting proximity effect. By measuring the TDR spectra of the silver layer in a Ag-(BiPb)₂Sr₂Ca₂Cu₃O₁₀ bi-layer junction or the indium layer in a In-Ag-(BiPb)₂Sr₂Ca₂Cu₃O₁₀ tri-layer junction, at temperatures above and below the critical temperature of the high temperature superconductor, we hope to observe structure due to a proximity induced gap function in the normal metal.

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Catherine L. Perry, Matthew J. Holcomb, James P. Collman, and William A. Little "Experimental studies of the high-temperature superconducting cuprates using thermal difference reflectance spectroscopy", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241808

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KEYWORDS

Superconductors

Temperature metrology

Reflectivity

Indium

Metals

Spectroscopy

Silver

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