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      https://www.ias.ac.in/article/fulltext/boms/020/02/0259-0264

    • Keywords

       

      Oxygen deficiency; transition temperature; coupling strength; screening parameter; yttrium cuprates

    • Abstract

       

      We have investigated the effects of oxygen deficiency (δ) on the transition temperature (Tc) of (Sm, Er)Ba2Cu3O7−δ superconductors by incorporating the effects of the two dimensional (2D) acoustic phonons and plasmons in the framework of strong coupling theory. The proposed approach for yttrium cuprates properly takes care of the double CuO2 plane in a unit cell and has been found earlier to be successful in describing the pairing mechanism as well as the variation ofTc withδ in Y Ba2Cu3O7−δ system. The coupling strength (λ), the screening parameter (μ*) and the two dimensional acoustic phonon (plasmon) energyħω+) as a function of oxygen deficiency is worked out. Finally, the transition temperature is evaluated and is found to be consistent with the earlier experimental data on yttrium cuprates. Thus, coupled phonon-plasmon mechanism is adequate to understand the nature of pairing mechanism and oxygen deficiency dependence of transition temperature in 90 K (Sm, Er)Ba2Cu3O7−δ superconductors.

    • Author Affiliations

       

      R K Singh1 Dinesh Varshney1 2 Amit K Khaskalam1

      1. School of Physics, Guru Ghasidas University, Bilaspur - 495 009, India
      2. School of Physics, Devi Ahilya University, Khandwa Road, Indore - 452 001, India
    • Dates

       
  • Bulletin of Materials Science | News

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