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  • 1
    Electronic Resource
    Electronic Resource
    Low frequency dielectric spectroscopy of the Peierls-Mott insulating state in the deuterated copper-DCNQI systems (2000)
    Springer
    The European physical journal 16 (2000), S. 487-493 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 72.15.Nj Collective modes, (e.g., in one-dimensional conductors) - 71.45.Lr Charge-density-wave systems - 71.30.+h Metal-insulator transitions and other electronic transitions - 77.22.Gm Dielectric loss and relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We report a detailed characterization of an unique 3-fold commensurate insulating state in single crystals of the organic – inorganic d hybrid Cu(DMe-DCNQI)2 systems with deuterated and partially deuterated DCNQI ring, by means of low-frequency dielectric spectroscopy. A broad relaxation mode of strength centred at kHz is observed in the hysteresis temperature region in which the insulating phase coexists with metallic islands. At lower temperatures, outside the nucleation range, the relaxation narrows, approaching a Debye-like form for an overdamped response of a system with a single degree of freedom. Both, the relaxation strength and the mean relaxation time ( ) are much larger than that expected for single-particle excitations. These features suggest the origin of the dielectric relaxation as an intrinsic property of the N = 3 charge density wave state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510070207
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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Complex low-frequency dielectric relaxation of the charge-density wave state in the (2.5(OCH 3 ) 2 DCNQI) 2 Li (2001)
    Springer
    The European physical journal 22 (2001), S. 335-341 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 72.15.Nj Collective modes (e.g., in one-dimensional conductors) – 71.45.Lr Charge-density-wave-systems – 77.22.Gm Dielectric loss and relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report a detailed characterization of an unique 2- and 4-fold commensurate charge density wave (CDW) state in single crystals of the organic conductor (2.5(OCH3)2DCNQI)2Li by means of low-frequency (0.1 Hz-1 MHz) dielectric spectroscopy. We show that in addition to the narrow Debye-like relaxation mode of strength Δɛ≈ 10 7 with Arrhenius-like resistive decay, associated with long wavelength phason excitations, a new mode of weaker strength Δɛ≈ 10 6 appears below 40 K and broadens with decrease in temperature. Below 25 K the mean relaxation time of the new mode saturates, whereas the Debye mode continues gradual slowing down with weaker temperature dependence, again similar to the DC conductivity. We attribute the new process to short wavelength CDW excitations that become dominant once the free carrier density is substantially reduced at low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510170111
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  • 4
    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)
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