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Bulletin of Materials Science

, Volume 21, Issue 6, pp 457–462 | Cite as

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

  • Dinesh Varshney
  • R K Singh
  • Amit K Khaskalam
Superconducting Materials
  • 38 Downloads

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 (τ e-ph) due to electron-phonon interaction is deduced. The variations inτ e-ph andρ e-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 resistivityρ 0 obtained by extrapolation from experimental data together withρ e-ph will predict the nearly-linear behaviour of normal state resistivity at temperatures (T) [90≤T≤300 K] in YBa2Cu3O7-δ superconductors.

Keywords

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

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Copyright information

© Indian Academy of Sciences 1998

Authors and Affiliations

  • Dinesh Varshney
    • 1
  • R K Singh
    • 1
    • 2
  • Amit K Khaskalam
    • 1
    • 2
  1. 1.School of PhysicsDevi Ahilya UniversityIndoreIndia
  2. 2.School of PhysicsGuru Ghasidas UniversityBilaspurIndia

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