Thermal difference reflectance spectroscopy of high-Tc superconductors

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

doi:10.1117/12.241769

10 June 1996 Thermal difference reflectance spectroscopy of high-T_c superconductors

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

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241769
Event: Photonics West '96, 1996, San Jose, CA, United States

Abstract

The temperature dependent thermal difference reflectance (TDR) spectra of thin film samples of Tl₂Ba₂Ca₂Cu₃O₁₀, (BiPb)₂Sr₂Ca₂Cu₃O₁₀, Tl₂Ba₂CaCu₂O₈ and YBa₂Cu₃O₇ have been measured for photon energies between 0.3 and 4.5 eV at temperatures above and below each material's superconducting critical temperature. The amplitude of the characteristic optical structure near the screened plasma frequency of each sample in the normal state TDR spectrum varies approximately linearly with temperature, T, indicating that the temperature dependent optical scattering rate in these materials scales with temperature as T². From the TDR spectra collected above and below the critical temperature of each sample, the superconducting to normal state reflectance ratio, R_s/R_N, has been obtained. In these materials, a feature exists in the experimental R_s/R_N spectrum at energies between 1.5 and 2.0 eV which can be accounted for by treating the superconductivity in an Eliashberg model with a coupling function that includes both an electron-phonon interaction and a high energy electron-boson interaction located between 1.6 and 2.1 eV. Good agreement is obtained between theory and experiment based upon this description of the superconducting state.

Citation Download Citation

Matthew J. Holcomb, Catherine L. Perry, James P. Collman, and William A. Little "Thermal difference reflectance spectroscopy of high-T_c superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241769

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