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- W2036991761 abstract "Nous avons mesuré les courbes d'aimantation, les températures de transition et les résistivités résiduelles de plusieurs échantillons monocristallins d'alliages du système plombthallium, et nous avons comparé nos mesures avec la théorie des supraconducteurs de la deuxième espèce, laquelle a été étendue récemment, par de Gennes, Maki, Helfand et Werthamer, aux températures nettement inférieures à Tc. A partir de nos mesures, on déduit directement la valeur de k, le paramètre de Ginzburg et Landau, pour chaque alliage. Nous avons également déterminé le coefficient de la chaleur spécifique électronique à l'état normal pour chaque alliage. L'expression théorique de Gorkov conduit à des valeurs de k qui sont en accord avec les valeurs expérimentales à environ 3% près. Les variations de Hc1 et de Hc2 avec la température sont bien en accord avec la théorie, mais, par contre, la variation trouvée pour la susceptibilité différentielle au voisinage de Hc2 est en désaccord net. Il est donc douteux que les alliages de plomb-thallium montrent le comportement de type III récemment prédit par Maki.(16) The magnetization curves, transition temperatures and residual resistivities of several monocrystalline specimens of lead-thallium alloys have been measured. The results are compared with the theory of superconductors of the second kind, which has recently been extended to temperatures well below Tc by de Gennes, Maki, Helfand and Werthamer. For each alloy the measurements yield a value for k, the Ginzburg-Landau parameter, and a value for the coefficient of the electronic specific heat in the normal state. The theoretical expression due to Gorkov leads to values of k which agree with the experimental values to within 3 %. The temperature dependences of Hc1 and Hc2 are in agreement with the theoretical predictions but, on the other hand, for the alloys studied, the temperature dependence of the differential susceptibility near Hc2 is in clear disagreement with the theory. It is therefore doubtful whether alloys of the lead-thallium system show the type III behaviour recently predicted by Maki.(16)" @default.
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- W2036991761 date "1965-07-01" @default.
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- W2036991761 title "Les supraconducteurs de la deuxieme espece du systeme plomb-thallium" @default.
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- W2036991761 doi "https://doi.org/10.1016/0022-3697(65)90011-9" @default.
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