Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Pressure dependence of the resistivity of (BEDO-TTF)"2ReO"4.(H"2O)
    Amsterdam : Elsevier
    Solid State Communications 83 (1992), S. 77-79 
    Details
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0038-1098(92)90017-4
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Charge localization in organic conductors (TM) X: The influence of anion ordering (1999)
    Springer
    The European physical journal 7 (1999), S. 529-532 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.10.Pm Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) - 74.70.Kn Organic superconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: An investigation of the different contributions leading to charge localization in a 1/2 or 1/4 filled band 1D conductor has been conducted through a study of transport properties in the solid solution [(TMTSF)1-x (TMTTF) x]2ReO4. The existence of an ordering transition of the anions allows to identify two contributions to the electronic potential with wave vector 4kF. A dominant on-site 4kF potential besides the bond contribution is revealed when Umklapp scattering is pertinent via the weakening of the localization arising at the (0, 1/2, 1/2) anion ordering which is stabilized under pressure in the compound [(TMTSF) 0.5 (TMTTF)0.5]2ReO4 at variance with the enhancement of localization observed in the homomolecular (TMTTF)2ReO 4 material.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050645
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    ( Sr / Ca ) 14 Cu 24 O 41 spin ladders studied by NMR under pressure (2001)
    Springer
    The European physical journal 24 (2001), S. 443-456 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.25.Ha Magnetic properties – 74.72.Jt Other cuprates – 76.60.Cq Chemical and Knight shifts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: 63Cu-NMR measurements have been performed on two-leg hole-doped spin ladders Sr14-xCaxCu24O41 single crystals 0 ? x ? 12 at several pressures up to the pressure domain where the stabilization of a superconducting ground state can be achieved. The data reveal a marked decrease of the spin gap derived from Knight shift measurements upon Ca substitution and also under pressure and confirm the onset of low lying spin excitations around P c as previously reported. The spin gap in Sr 2 Ca 12 Cu 24 O 41 is strongly reduced above 20 kbar. However, the data of an experiment performed at P = 36 kbar where superconductivity has been detected at 6.7 K by an inductive technique have shown that a significant amount of spin excitations remains gapped at 80 K when superconductivity sets in. The standard relaxation model with two and three-magnon modes explains fairly well the activated relaxation data in the intermediate temperature regime corresponding to gapped spin excitations using the spin gap data derived from Knight shift experiments. The data of Gaussian relaxation rates of heavily doped samples support the limitation of the coherence length at low temperature by the average distance between doped holes. We discuss the interplay between superconductivity and the spin gap and suggest that these new results support the exciting prospect of superconductivity induced by the interladder tunneling of preformed pairs as long as the pressure remains lower than the pressure corresponding to the maximum of the superconducting critical temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10051-001-8697-y
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Electronic localization in an extreme 1-D conductor: the organic salt (TTDM-TTF) [Au(mnt) ] (2002)
    Springer
    The European physical journal 29 (2002), S. 27-33 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 72.80.Le Polymers; organic compounds – 72.20.Pa Thermoelectric and thermomagnetic effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: This article reports the investigation of a new low-dimensional organic salt, (TTDM-TTF)2 [Au(mnt)2], by single crystal X-ray diffraction, static magnetic susceptibility, EPR, thermopower, electrical resistivity measurements under pressure up to 25 kbar and band structure calculations. The crystal structure consists in a dimerized head to tail stacking of TTDM-TTF molecules separated by layers of orthogonal Au(mnt)2 anions. The absence of overlap between neighboring chains coming from this particular crystal structure leads to an extreme one-dimensionality (1-D) for which the carriers of the half-filled conduction band become strongly localized in a Mott-Hubbard insulating state. This material is the first 1-D conductor in which the Mott-Hubbard insulating character cannot be suppressed under pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2002-00258-x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Transverse transport in organic conductors: possible evidence for a Luttinger liquid (1998)
    Springer
    The European physical journal 1 (1998), S. 39-46 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 67.55.Hc Transport properties - 71.10.Pm Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.) - 74.20.Mn Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, luttinger liquid, etc.)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present c-axis resistivity measurements performed on the organic conductors and under pressure. The aim is to probe the density of states of quasi-one dimensional compounds the high temperature properties of which are those of a Luttinger liquid. It is found that the 1-D Luttinger description breaks down below a specific pressure-dependent temperature, giving rise to a transient regime. The Fermi liquid behaviour is however restored at low temperature i.e. around 10 K, as evidenced by NMR measurements. Accordingly, two different energy scales 100 K and 10 K are required to get a fair understanding of all observed physical phenomena. Our interpretation supports the picture of a power law exponent for the correlation functions of the order of 0.25–0.30.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050150
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    An NMR approach to the superconducting regime of the spin ladder compound Sr Ca Cu O (2000)
    Springer
    The European physical journal 13 (2000), S. 417-420 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 74.72.Jt Other cuprates - 74.25.Ha Magnetic properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: 63Cu-NMR experiments of Knight shift and relaxation time T1 have been performed on the two-leg spin ladders of a Sr2Ca12Cu24O41 single crystal at several pressures up to the critical pressure for the stabilization of a superconducting ground state. The data confirm the onset of low-lying spin excitations at observed previously [Science 279, 345 (1998)] and reveal a marked decrease of the spin gap under pressures above 20 kbar although a significant fraction of the spin excitations remains gapped at kbar. A comparison between NMR and transport data under pressure suggests that the depression of the spin gap can be ascribed to an increase in the interladder exchange coupling, possibly mediated by the ladder-chain interaction along the b-direction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050052
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...