EFFECT OF LOCAL CORRELATIONS ONs-WAVE SYMMETRY SUPERCONDUCTIVITY

A. A. Schmidt () and J. J. Rodríguez-Núñez ()
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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

International Journal of Modern Physics C (IJMPC), 2000, vol. 11, issue 06, 1149-1156

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.

Keywords: Local Correlations; Superconductivity (search for similar items in EconPapers)
Date: 2000
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DOI: 10.1142/S0129183100000924

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