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Based on two-band isotropic Ginzburg-Landau theory, we study the temperature dependence of upper critical field and London penetration depth for non-centrosymmetric superconductor LaNi[C.sub.2]. All the theoretical calculations fit the experimental data very well, especially the upward curvature of upper critical field near the critical temperature. Our results thus indicate that the two-gap scenario is better to account for the superconductivity of LaNi[C.sub.2], and the Cooper pairs of this superconductor are in the conventional s-wave state. Key words: non-centrosymmetric superconductor, Ginzburg-Landau theory, upper critical field, London penetration depth. Sur la base de la theorie isotrope a deux bandes de Ginzberg-Landau, nous etudions la dependance en temperature du champ critique superieur et de la profondeur de la penetration de Landau pour le supraconducteur non centro-symetrique LaNi[C.sub.2]. Tous les calculs theoriques sont en tres bon accord avec les valeurs experimentales, specialement la courbure superieure du champ critique superieur pres de la temperature critique. Nos resultats indiquent ainsi que le scenario a deux bandes est le meilleur pour decrire la supraconductivite de LaNi[C.sub.2] et que la paire de Cooper est dans l'etat conventionnel de l'onde s. [Traduit par la Redaction] Mots-cles: supraconducteur non centro-symetrique, theorie de Ginzberg-Landau, champ critique superieur, profondeur de la penetration de London, scenario a deux bandes., 1. Introduction In the past 10 years, non-centrosymmetric superconductors have gained huge interest since the discovery of superconductivity in heavy-fermion material Ce[Pt.sub.3]Si [1]. For the superconductors with unbroken inversion symmetry, [...]

Based on two-band isotropic Ginzburg-Landau theory, we study the temperature dependence of upper critical field and London penetration depth for non-centrosymmetric superconductor LaNiC2. All the theoretical calculations fit the experimental data very well, especially the upward curvature of upper critical field near the critical temperature. Our results thus indicate that the two-gap scenario is better to account for the superconductivity of LaNiC2, and the Cooper pairs of this superconductor are in the conventional s-wave state. [ABSTRACT FROM AUTHOR]

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