Temperature and pressure dependencies of the crystal structure of the organic superconductor (TMTSF) 2 ClO 4

Pevelen, Delphine D. Le; Gaultier, J.; Barrans, Y.; Chasseau, D.; Castet, Frédéric; Ducasse, Laurent

doi:10.1007/s100510170312

Cited by 42 publications

(69 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We associate these oscillations with the rapid oscillations in 1/B with a frequency of 260 Tesla, observed in various transport and thermodynamic quantities in the metallic as well as in the FISDW state of relaxed (TMTSF) 2 ClO 4 [10 -12]. Choosing the characteristic values of parameters (t =300K, v F = 2·10 5 m/s, b = 7.7·10 -10 m) we get the best fit for V ≈ 0.8 t. This again indicates that the anion potential V in the relaxed (TMTSF) 2 ClO 4 is rather strong, in agreement with other independent evidences [5][6][7], but at variance with suggestions based on earlier X-ray measurements [13]. …”

Section: Discussionsupporting

confidence: 83%

Exact solution of the magnetic breakdown problem in quasi-one-dimensional geometry

Radić¹,

Bjeliš²,

Zanchi³

2004

J. Phys. IV France

View full text Add to dashboard Cite

Abstract. We present exact solution of the problem of electronic wave functions of quasi one-dimensional band with an inter-band gap at the Fermi surface and in the presence of magnetic field. The details of the analyzed model are appropriate to the situation in the Bechgaard salt (TMTSF) 2 ClO 4 with the dimerizing anion order in the transverse direction. Limiting the effects of dimerization to the standard dimerization gap only, one obtains the electronic spectrum represented through solutions of a generalized Hill system of equations with simply periodic coefficients. The resulting wave-functions are discussed. In particular, we present the solutions for the case when the electrons spend as much time in the "junctions" as on their quasi-classical orbits. On the other hand, the limit when the tunnelling approach is valid is identified and the results are confronted with the well-known Slutskin-Kadigrobov solution. Furthermore, taking into account also the presumably finite transverse dimerizing displacements of chains, one encounters the qualitatively more complex problem of a system of equations with two-periodic coefficients. Some qualitatively new properties of electronic spectrum and corresponding one-electron physical quantities in this case will be discussed in detail.Key words. anion gap, magnetic breakdown MOTIVATIONThe field-induced spin density wave (FISDW) state and other physical properties of Bechgaard salts with one open Fermi surface are interpreted by the well-known concept of one-dimensionalization of open electron orbits in the plane perpendicular to the external magnetic field B [1]. However, in slowly cooled samples of (TMTSF) 2 ClO 4 with the orientational anion ordering the Brillouin zone is reduced due to a finite dimerization potential along the b-axis perpendicular to the chain direction, and the electron spectrum is split into two sub-bands. Then one encounters the problem of magnetic breakdown of quasi-classical electron orbits through the barrier separating two Fermi surfaces. In the standard treatment [2,3] of this problem one constructs new electron states by including only the local tunnelling through the barrier at the Brillouin zone edges (transverse wave number close to π /2b). This approach is justified provided that the magnetic breakdown parameter κ ≡ ω c t/V 2 is (much) larger than unity [4]. Here V is the potential generated by the anion ordering, t is transverse hopping integral, and ω c ≡ v F eBb/ћ is cyclotron frequency.For κ >>1 one has strong magnetic breakdown, i. e. the tunnelling probability exp (-1/κ) is large. Evidently this regime is possible only if V is weak with respect to t. However recent experimental [5] and theoretic [6,7] results suggest that V might be of the order or larger than t. In this case one cannot use the standard method of Refs. [2][3][4]. We introduce in the present paper an alternative exact approach, generally applicable to the problem of magnetic breakdown. EXACT APPROACHWe start from the basic one-electron Hamiltonian with the Peierls su...

show abstract

Section: Discussionsupporting

confidence: 83%

Exact solution of the magnetic breakdown problem in quasi-one-dimensional geometry

Radić¹,

Bjeliš²,

Zanchi³

2004

J. Phys. IV France

View full text Add to dashboard Cite

show abstract

“…Even for the quasi-1D materials triangular lattice structure is present in the interchain hopping integrals [11]. The addition of intrinsic dimerization to Eq.…”

Section: Discussion: Cts Materialsmentioning

confidence: 99%

Local singlets, frustration, and unconventional superconductivity in the organic charge-transfer solids

Clay¹,

Mazumdar²,

Li³

2009

Physica B: Condensed Matter

View full text Add to dashboard Cite

We suggest that superconductivity (SC) in the organic charge transfer solids (CTS) is reached from a Bond-Charge Density Wave (BCDW). We discuss an effective model for the BCDW to SC transition, an attractive U extended Hubbard Hamiltonian with repulsive nearest neighbor interaction V . We discuss experimental consequences of the theory for different classes of CTS superconductors as well as related inorganic materials.

show abstract

“…The transfer energies are given by [12,13,11] ′ and t ′′ correspond to transfer energies between molecules in a unit cell, those between the nearest neighbor cells, and those between the next-nearest neighbor cells, respectively. Note t αβ = t βα .…”

Section: Modelmentioning

confidence: 99%

“…[8] We use the extended multi-site Hubbard model representing the system of (TMTSF) 2 ClO 4 , when the transfer energies are given by the extended Hückel method with the X-ray diffraction measurement. [13] The unit cell consists of four TMTSF sites owing to the presence of the anion ordering. Fruther, the roles of the charge fluctuation for the triplet state are also investigated on such a multi-site system.…”

Section: Introductionmentioning

confidence: 99%

“…The folded Fermi surfaces with a unit cell containing four TMTSF molecules is obtained from the transfer integrals, which are estimated from the extended Hückel method based on the X-ray diffraction measurement. [11,12,13] Several theoretical works have been performed to understand the superconductivity in the quasi-one dimensional organic conductors. The single band models for (TMTSF) 2 PF 6 has been investigated by perturbation theories.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Role of charge fluctuation in Q1D organic superconductor (TMTSF)2ClO4

Mizuno

Kobayashi

Suzumura

2011

Physica C: Superconductivity

View full text Add to dashboard Cite

We have theoretically investigated the spin and charge fluctuations in the quasi-one dimensional organic superconductor (TMTSF) 2 ClO 4 . Using the extended multi-site Hubbard model, which contains four sites in a unit cell and the transfer energies obtained by the extended Hückel method, we calculate the linearized gap equation with the random phase approximation, to find novel order parameters of superconductivity due to several kinds of charge fluctuations induced by the anisotropic intersite repulsive interactions. For the singlet state, the order parameter with line nodes appears in the case of the strong charge fluctuation, while the order parameter with anisotropic gap suggested by Shimahara is reproduced in the spin fluctuation. The triplet state is also obtained for the wide parameter range of repulsive interactions due to a cooperation between charge and spin fluctuations.

show abstract

Temperature and pressure dependencies of the crystal structure of the organic superconductor (TMTSF) 2 ClO 4

Cited by 42 publications

References 1 publication

Exact solution of the magnetic breakdown problem in quasi-one-dimensional geometry

Exact solution of the magnetic breakdown problem in quasi-one-dimensional geometry

Local singlets, frustration, and unconventional superconductivity in the organic charge-transfer solids

Role of charge fluctuation in Q1D organic superconductor (TMTSF)2ClO4

Contact Info

Product

Resources

About