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  • 1
    Electronic Resource
    Electronic Resource
    Coexistence of superconductivity and spin density wave orderings in the organic superconductor (TMTSF) 2 PF 6 (2002)
    Springer
    The European physical journal 25 (2002), S. 319-331 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.10.Ay Fermi-liquid theory and other phenomenological models – 74.25.Dw Superconductivity phase diagrams – 74.70.Kn Organic superconductors – 75.30.Fv Spin-density waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The phase diagram of the organic superconductor (TMTSF)2PF6has been revisited using transport measurements with an improved control of the applied pressure. We have found a 0.8 kbar wide pressure domain below the critical point (9.43 kbar, 1.2 K) for the stabilisation of the superconducting ground state featuring a coexistence regime between spin density wave (SDW) and superconductivity (SC). The inhomogeneous character of the said pressure domain is supported by the analysis of the resistivity between T SDW and T SC and the superconducting critical current. The onset temperature T SC is practically constant ( 1.20±0.01 K) in this region where only the SC/SDW domain proportion below T SC is increasing under pressure. An homogeneous superconducting state is recovered above the critical pressure with T SC falling at increasing pressure. We propose a model comparing the free energy of a phase exhibiting a segregation between SDW and SC domains and the free energy of homogeneous phases which explains fairly well our experimental findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e20020037
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of quantum Hall effect on linear and nonlinear conductivity in the FISDW states of the organic conductor (TMTSF) 2PF 6 (2001)
    Springer
    The European physical journal 21 (2001), S. 53-60 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 75.30.Fv Spin-density waves – 73.43.-f Quantum Hall effects – 72.15.Nj Collective modes (e.g., in one-dimensional conductors)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report a detailed characterization of quantum Hall effect (QHE) influence on the linear and non-linear resistivity tensor in FISDW phases of the organic conductor (TMTSF)2PF6. We show that the behavior at low electric fields, observed for nominally pure single-crystals with different values of the resistivity ratio, is fully consistent with a theoretical model, which takes QHE nature of FISDW and residual quasi-particle density associated with different crystal imperfection levels into account. The non-linearity in longitudinal and diagonal resistivity tensor components observed at large electric fields reconciles preceding contradictory results. Our theoretical model offers a qualitatively good explanation of the observed features if a sliding of the density wave with the concomitant destruction of QHE, switched on above a finite electric field, is taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170212
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    Paper (German National Licenses)
    Fulltext
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