26 research outputs found

    Organic Superconductors: when correlations and magnetism walk in

    Full text link
    This survey provides a brief account for the start of organic superconductivity motivated by the quest for high Tc superconductors and its development since the eighties'. Besides superconductivity found in 1D organics in 1980, progresses in this field of research have contributed to better understand the physics of low dimensional conductors highlighted by the wealth of new remarkable properties. Correlations conspire to govern the low temperature properties of the metallic phase. The contribution of antiferromagnetic fluctuations to the interchain Cooper pairing proposed by the theory is borne out by experimental investigations and supports supercondutivity emerging from a non Fermi liquid background. Quasi one dimensional organic superconductors can therefore be considered as simple prototype systems for the more complex high Tc materials.Comment: 41 pages, 21 figures to be published in Journal of Superconductivity and Novel Magnetis

    STRUCTURES CRISTALLINES DE PRODUITS DONNANT UNE PHASE NÉMATIQUE A LA FUSION

    No full text
    Les structures cristallines de deux composés donnant une phase nématique à la fusion ont été déterminées à partir des données de diffraction de Rayons X par des monocristaux. Il s'agit de l'anisaldazine : CH3-O-C6H4-CH = N-N = CH-C6H4-O-CH3 et du 4-4' azodiphénétole : C2H5-O-C6H4-N = N-C6H4-O-C2H5. Bien que ces deux produits cristallisent dans des groupes de symétrie différents, l'empilement des molécules est assez semblable et montre que les interactions dipôle-dipôle existent à l'état cristallisé.The crystal structures of two nematogenic compounds have been determined from X-Ray diffraction data collected with a single crystal diffractometer. These two compounds are : Anisaldazine CH3-O-C6H4-CH = N-N = CH-C6H4-O-CH3 and 4-4' azodiphenetole C2H5-O-C6H4-N = N-C6H4-O-C2H5. Though they cristallize in two different space groups, the packing of molecules is similar and show that interactions dipole-dipole exist in crystalline state

    Programmes pour calculs cristallographiques réalisés sur calculateur électronique I. B. M. 1620

    No full text
    Falgueirettes Jean, Galigné Jean-Louis, Lapasset Jacques. Programmes pour calculs cristallographiques réalisés sur calculateur électronique I. B. M. 1620. In: Bulletin de la Société française de Minéralogie et de Cristallographie, volume 87, 1, 1964. pp. 90-93
    corecore