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EFFECT OF LOCAL CORRELATIONS ONs-WAVE SYMMETRY SUPERCONDUCTIVITY

Author

Listed:
  • A. A. SCHMIDT

    (Departamento de Matemática–CCNE, Universidade Federal de Santa Maria, 97105-900 Santa Maria/RS, Brazil)

  • J. J. RODRÍGUEZ-NÚÑEZ

    (Departamento de Física–FACYT, Universidad de Carabobo, Av. Los Colegios, Quinta Hilmar, Urb. Guaparo, Valencia, Edo. Carabobo, Venezuela)

Abstract

We derive superconducting mean-field equations for an attractive interactionVin thes-wave channel when local Coulomb interactions are taken into account for any value ofU. Results show that Coulomb repulsion diminishes the critical temperatureTcto the order parameterΔ(T)for values ofU ≥ |V|. Furthermore, the results are also quite sensible to band filling. In the presence of local correlations,2Δ(0)/Tcdiffers from the BCS ratio since Coulomb interactions affect much more superconducting critical temperatureTcthan superconducting order parameterΔ(T). Some consequences of our findings for experimental measurements in narrow band systems are discussed.

Suggested Citation

  • A. A. Schmidt & J. J. Rodríguez-Núñez, 2000. "EFFECT OF LOCAL CORRELATIONS ONs-WAVE SYMMETRY SUPERCONDUCTIVITY," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 11(06), pages 1149-1156.
    • Handle: RePEc:wsi:ijmpcx:v:11:y:2000:i:06:n:s0129183100000924
    DOI: 10.1142/S0129183100000924
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    Keywords

    Local Correlations; Superconductivity;

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