• Kramers-Kronig analysis of the reflectance spectra of Pb-doped Bi-4334 type glass and the corresponding glass-ceramic superconductor

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    • Keywords

       

      Optical reflectivity; superconductivity; exciton

    • Abstract

       

      The room temperature reflectance spectra in UV-VIS-NIR region (energy range of 0.6 to 6.2 eV) for glassy, partially crystalline and its fully crystalline superconducting ceramic phases of Bi3.9Pb0.1Sr3Ca3Cu4Ox have been studied by Kramers-Kronig (KK) analysis. A comparative study of the energy loss function [− Im (1/ε)] and the absorption coefficient [α(E)] has been done. Excitions in the superconducting phase hitherto evidenced by the authors are located in the polarizable layers of the superconducting cuprate and their implications for superconductivity have been pointed out. An estimate of the optical band gap energy (Eg) has also been made from the linear fit ofα2 vs.E curve for the superconducting phase. Jezierski’s method ofR-extrapolations in the higher energy has been used to show that both methods yield results that agree quantitatively and can be relied upon.

    • Author Affiliations

       

      Souri Banerjee1 S Chatterjee1 B K Chaudhuri1

      1. Department of Solid State Physics, Indian Association for the Cultivation of Science, Calcutta - 700 032, India
    • Dates

       
  • Pramana – Journal of Physics | News

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