Band-structure parameters of a series of tetramethyltetraselenafulvalene [<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">TMTSF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi>X</mml:mi></mml:math>] compounds

Grant, P. M.

doi:10.1103/physrevb.26.6888

Cited by 98 publications

(42 citation statements)

References 26 publications

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“…The values of the intrachain hopping parameters in our work are consistent with those found for similar systems in previous experimental and theoretical investigations. [27][28][29][30][31][32][33] Missing in those previous studies is a thorough analysis of the intrachain dimerization as well as the interchain hopping parameters.…”

Section: A Anion Dependence Of the Structural And Electronic Propertiesmentioning

confidence: 99%

Electronic properties of Fabre charge-transfer salts under various temperature and pressure conditions

et al. 2013

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Using density functional theory, we determine parameters of tight-binding Hamiltonians for a variety of Fabre charge transfer salts, focusing, in particular, on the effects of temperature and pressure. Besides relying on previously published crystal structures, we experimentally determine two new sets of structures: (TMTTF) 2 SbF 6 at different temperatures and (TMTTF) 2 PF 6 under various hydrostatic pressures. We find that a few trends in the electronic behavior can be connected to the complex phase diagram shown by these materials. Decreasing temperature and increasing pressure cause the systems to become more two dimensional. We analyze the importance of correlations by considering an extended Hubbard model parameterized using Wannier orbital overlaps and show that while charge order is strongly activated by the intersite Coulomb interaction, the magnetic order is only weakly enhanced. Both orders are suppressed when the effective pressure is increased.

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Section: A Anion Dependence Of the Structural And Electronic Propertiesmentioning

confidence: 99%

Electronic properties of Fabre charge-transfer salts under various temperature and pressure conditions

et al. 2013

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“…Using 4t a = 1.0 eV together with measured resistivity gives ͑t a : t b : t c ͒Ϸ͑250: 10: 1͒ meV, which is quite close to the anisotropy ͑t a : t b : t c ͒ = ͑250: 17: 0.75͒ meV as determined by Grant by band structure calculations. 49 The increase of b Ј / a below 50 K is mainly caused by the transverse resistivity in bЈ direction which levels off as the spin-density-wave transition at 12 K is approached. It is not clear at this point, however, whether fluctuations are solely responsible for this behavior since they are expected to dominate along the chains.…”

Section: A "Tmtsf… 2 Pfmentioning

confidence: 99%

Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors

et al. 2005

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We report on dc and microwave experiments of the low-dimensional organic conductors ͑TMTSF͒ 2 PF 6 and ͑TMTSF͒ 2 ClO 4 along the a, bЈ, and c * directions. In the normal state of ͑TMTSF͒ 2 PF 6 below T = 70 K, the dc resistivity follows a power law with a and b Ј proportional to T 2 while c * ϰ T. Above T = 100 K the exponents extracted from the data for the a and c * axes are consistent with what is to be expected for a system of coupled one-dimensional chains ͑Luttinger liquid͒ and a dimensional crossover at a temperature of about 100 K. The bЈ axis shows anomalous exponents that could be attributed to a large crossover between these two regimes. The contactless microwave measurements of single crystals along the bЈ axis reveal an anomaly between 25 and 55 K which is not understood yet. The organic superconductor ͑TMTSF͒ 2 ClO 4 is more a two-dimensional metal with an anisotropy a / b Ј of approximately 2 at all temperatures. Such a low anisotropy is unexpected in view of the transfer integrals. Slight indications to one-dimensionality are found in the temperature dependent transport only above 200 K. Even along the least conducting c * direction no region with semiconducting behavior is revealed up to room temperature.

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“…In the calculation of the critical fields, the values used in the litterature [10,28,38,39] for t c range from 2 K to 17 K, and those used for the anisotropy ratio t a /t c range from ∼ 200 to ∼ 700. However, the maximum LOFF critical field, H…”

Section: Lof F Cmentioning

confidence: 99%

Symmetries of the quasi-1D Bechgaard salts superconducting state in an applied magnetic field

2008

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We investigate the possible superconducting pairing symmetries which would account for the latest experimental results on the Bechgaard salts. Using a renormalization group (R.G) technique we calculate the couplings of the singlet and triplet interactions in the quasi 1D Hamiltonian. In the presence of interchain interactions, the singlet and triplet couplings are of the same order of magnitude. The renormalized couplings are then used in an RPA calculation to evaluate the critical fields of superconductivity for the two dominant order parameter symmetries in the R.G flow, i.e, the d x 2 −y 2 and fy symmetries. It is shown that, for the standard values of the anisotropy ratio of the Fermi surface, the critical fields of the singlet symmetry are strongly reduced. A reentrant superconductivity is however still present for the triplet state.

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Band-structure parameters of a series of tetramethyltetraselenafulvalene [(TMTSF)2X] compounds

Cited by 98 publications

References 26 publications

Electronic properties of Fabre charge-transfer salts under various temperature and pressure conditions

Electronic properties of Fabre charge-transfer salts under various temperature and pressure conditions

Scaling behavior of the longitudinal and transverse transport in quasi-one-dimensional organic conductors

Symmetries of the quasi-1D Bechgaard salts superconducting state in an applied magnetic field

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