• Effect of oxygen deficiency (δ) on normal state resistivity of YBa2Cu3O7-δ superconductors

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      https://www.ias.ac.in/article/fulltext/boms/021/06/0457-0462

    • Keywords

       

      Oxygen deficiency; electron-phonon coupling strength; inelastic scattering rate; normal state resistivity

    • Abstract

       

      We have investigated theoretically the effect of oxygen deficiency (δ) on normal state resistivity (ρ) as well as its temperature dependence in YBa2Cu3O7-δ superconductors. This has been based on a potential which incorporates the structure factors and various interactions for double two-dimensional (2-D) conducting CuO2 plane. Using the Coulomb and electron-phonon terms of the interaction potential, we have then worked out the coupling strength (γ) for neighbouring electrons linked via 2-D acoustic phonons (_). Furthermore, the scattering time (τe-ph) due to electron-phonon interaction is deduced. The variations inτe-ph andρe-ph are studied with oxygen deficiency (δ) which is in the range of 0·0≤δ≤1·0, and the results thus obtained are found to be consistent with the earlier reported data. The residual resistivityρ0 obtained by extrapolation from experimental data together withρe-ph will predict the nearly-linear behaviour of normal state resistivity at temperatures (T) [90≤T≤300 K] in YBa2Cu3O7-δ superconductors.

    • Author Affiliations

       

      Dinesh Varshney1 2 R K Singh1 3 Amit K Khaskalam1 3

      1. School of Physics, Devi Ahilya University, Khandwa Road, Indore - 452 017, India
      2. Istituto Nazionale di Fisica della Materia and Classe di Scienze, Scuola Normale Superiore, Piazza dei Cavalieri 7, Pisa - I-56126, Italy
      3. School of Physics, Guru Ghasidas University, Bilaspur - 495 009, India
    • Dates

       
  • Bulletin of Materials Science | News

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