14 research outputs found

    Solid State Density in Equations of State for Fluids

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    The correlation between the density of a substance at the critical point and in the solid state is examined in view of the amazing empirical feature that the ratio between the above two densities is a constant for most substances. This universal feature offers a new criterion for assessing some improved versions of van der Waals equation of state for fluids

    HYSTERESIS OF THE CRITICAL CURRENT IN NONEQUILIBRIUM SUPERCONDUCTORS

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    On présente les résultats des investigations expérimentales d'hystérésis du courant critique dans les ponts supraconducteurs à effet de proximité portés hors d'équilibre par injection de phonons à travers une bande métallique, normale et transversale. On examine le rapport des résultats aux théories existantes de supraconducteurs hors d'équilibre.The results of our experimental investigations of the hysteresis of the critical current in superconducting proximity effect bridges driven into nonequilibrium states by injecting phonons through the transverse normal metal strip are reported. The relevance of the results to the existing theories of non-equilibrium superconductors is examined

    CONTROLLABLE PROXIMITY-EFFECT WEAK-LINKS

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    On remarque que l'injection d'un courant continu dans la couche de métal normal d'une jonction faible avec effet de proximité, a pour résultat une diminution systématique du courant critique de la jonction. On observe aussi qu'un rapport simple mais bien défini existe entre le courant d'injection et le courant critique. Ceci suggère que les caractéristiques (c'est-à-dire les courants critiques) de ce type de jonction pourraient être ajustés électriquement et continuement à n'importe quelle température au-dessous de la température de transition supraconductrice.We have observed that dc injection through the normal-metal strip across a long proximity -effect weak-link causes a systematic reduction in the critical current of the weak-link. We also observe that a simple well-defined relationship exists between the injection current and the critical current. This suggests that the characteristics (e.g. critical currents) of these types of weak-links can be electrically and continuously tuned at any temperature below the superconducting transition temperature

    Self-heating-induced phenomena in long reentrant ferromagnetic thin film superconductors

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    We predict several novel self-heating-induced features of the current-voltage characteristics at bath temperatures below the lower critical temperature as well as the temperature dependence of the various critical currents of long reentrant ferromagnetic thin film superconductors on the basis of existing theories and available experimental results. Further we point out how the experimental investigation of the above can lead to a better understanding of reentrant superconductivity and magnetic Kapitza resistance

    Detachable leads for superconducting magnets

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    A simple design of detachable leads has been incorporated in superconducting solenoids. Preliminary tests have shown very satisfactory behavior of the leads up to 100 A to produce a magnetic field of 5.0 T in a bore of 22 mm. Such leads will be useful for energizing superconducting magnets in small liquid helium dewars of 1–2 ℓ capacity
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