Possibility of superconducting precursor effects in quasi-one-dimensional organic conductors : theory and experiments

Schulz, H.; Jérôme, D.; Mazaud, A.; Ribault, M.; Bechgaard, K.

doi:10.1051/jphys:01981004207099100

Cited by 59 publications

(31 citation statements)

References 45 publications

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“…26 The analogous procedure is applied for b Ј (V) , because it was found that both a and b increase under pressure at room temperature at a common rate of 25% kbar Ϫ1 ͑Refs. 4 and 28͒ and a / b is essentially T and P independent above TϷ25 K. 4, 28 We have therefore converted our data using the same P values as for (TMTSF) 2 PF 6 and (TMTSF) 2 AsF 6 that have been calculated from Refs. 4 and 26 and are presented in the inset of Fig.…”

Section: Discussionmentioning

confidence: 99%

Conduction anisotropy, Hall effect, and magnetoresistance of(TMTSF)2ReO4at high temperatures

et al. 2003

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We investigated the transport properties of the quasi-one-dimensional organic metal (TMTSF) 2 ReO 4 above the anion-ordering metal-insulator transition (T AO Ϸ180 K). The pronounced conductivity anisotropy, a small and smoothly temperature-dependent Hall effect; and a small, positive, and temperature-dependent magnetoresistance are analyzed within the existing Fermi-liquid and non-Fermi-liquid models. We propose that the transport properties of quasi-one-dimensional Bechgaard salts at high temperatures can be described within the Fermi-liquid description.

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Section: Discussionmentioning

confidence: 99%

Conduction anisotropy, Hall effect, and magnetoresistance of(TMTSF)2ReO4at high temperatures

et al. 2003

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“…The theoretical basis for the downturn of the resistivity has already been debated in the past [22] with no common consensus reached [23,24] and it will be the subject of a forthcoming publication. It was claimed that the behaviour of the resistivity could be interpreted as precursors to the superconducting ground state with large fluctuations around a mean field transition temperature of (10-15K) within the framework of existing band structure calculations [22].…”

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Impurity-controlled superconductivity/spin density wave interplay in the organic superconductor: (TMTSF) ₂ ClO ₄

Joo¹,

Auban‐Senzier²,

Pasquier³

et al. 2005

Europhys. Lett.

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PACS. 74.70.Kn -Organic superconductors. PACS. 74.62.Dh -Effects of crystal defects, doping and substitution.Abstract. -The study of the anion ordered (T M T SF )2ClO 4(1−x) ReO4x solid solution in the limit of a low ReO − 4 substitution level (0 ≤ x ≤ 17%) has revealed a new and interesting phase diagram. Superconductivity is drastically suppressed as the effect of ReO − 4 non magnetic point defects increases following the digamma behaviour for usual superconductors in the presence of paramagnetic impurities. Then, no long range order can be stabilized above 0.1K in a narrow window of substitution. Finally, an insulating SDW ground state in ReO − 4 -rich samples is rapidly stabilized with the decrease of the potential strength leading to the doubling of the transverse periodicity. This extensive study has shown that the superconducting order parameter must change its sign over the Fermi surface.c EDP Sciences

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“…The fluctuation region is so small that tiny discontinuities at the transition caused by fluctuations would be impossible to observe. In Q1D systems, such as Bechgaard salts, the fluctuation region is expected to be large [30] and the discontinuous nature of the Normal to TSC transition may be experimentally accessible. This transition has been investigated through specific heat measurements in (TMTSF) 2 ClO 4 [31].…”

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SO(4) Theory of Antiferromagnetism and Superconductivity in Bechgaard Salts

et al. 2004

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Motivated by recent experiments with Bechgaard salts, we investigate the competition between antiferromagnetism and triplet superconductivity in quasi one-dimensional electron systems. We unify the two orders in an SO(4) symmetric framework, and demonstrate the existence of such symmetry in one-dimensional Luttinger liquids. SO(4) symmetry, which strongly constrains the phase diagram, can explain coexistence regions between antiferromagnetic, superconducting, and normal phases, as observed in (TMTSF)2PF6. We predict a sharp neutron scattering resonance in superconducting samples.A common feature of many strongly correlated electron systems is proximity of a superconducting state to some kind of magnetically ordered insulating state. Examples include organic materials [1,2], heavy fermion superconductors [3,4], and high T c cuprates [5]. Several theoretical analyses suggest that a strong repulsion between the two orders plays an important role in determining the phase diagram and low energy properties of these materials [6]. The idea of competing orders was developed into the SO(5) theory of high T c superconductivity of S.C. Zhang [7]. SO(5) symmetry has also been applied to study competition of ferromagnetism and p-wave superconductivity in Sr 2 RuO 4 [8], and antiferromagnetism and d-wave superconductivity in κ-BEDT-TTF salts [9].In this paper we consider the interplay of antiferromagnetism (AF) and triplet superconductivity (TSC) in quasi one-dimensional (Q1D) electron systems. Our study is motivated by Q1D Bechgaard salts (TMTSF) 2 X. The most well studied material from this family, (TMTSF) 2 PF 6 , is an antiferromagnetic insulator at ambient pressure and a superconductor at high pressures [10,11,12,13]. The symmetry of the superconducting order parameter in (TMTSF) 2 PF 6 is not yet fully established, but there is strong evidence that electron pairing is spin triplet: the superconducting T c is strongly suppressed by disorder [14]; critical magnetic field H c2 in the interchain direction exceeds the paramagnetic limit [15]; the electron spin susceptibility, obtained from Knight shift measurements, does not decrease below T c [16]. In another material from this family, (TMTSF) 2 ClO 4 , superconductivity is stable at ambient pressure and also shows signatures of triplet pairing [17,18,19,20]. Insulator to superconductor transition as a function of pressure has also been found in(TMTSF) 2 AsF 6 [21].The phase diagram of interacting electrons in one dimension was obtained in Ref. 22 using bosonization and renormalization group (RG) analyses. At incommensurate filling, this system has a phase boundary between spin density wave (SDW) and TSC phases when K ρ = 1 and g 1 > 0 (K ρ is the Luttinger parameter in the charge sector, g 1 the backward scattering amplitude). The starting point of our discussion is the observation that, in the absence of umklapp, 1D Luttinger liquids have an "isospin" SO(4) iso symmetry [23] at the boundary between SDW and TSC phases. To define this symmetry, we introduce the charge of le...

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Possibility of superconducting precursor effects in quasi-one-dimensional organic conductors : theory and experiments

Cited by 59 publications

References 45 publications

Conduction anisotropy, Hall effect, and magnetoresistance of(TMTSF)2ReO4at high temperatures

Conduction anisotropy, Hall effect, and magnetoresistance of(TMTSF)2ReO4at high temperatures

Impurity-controlled superconductivity/spin density wave interplay in the organic superconductor: (TMTSF) ₂ ClO ₄

SO(4) Theory of Antiferromagnetism and Superconductivity in Bechgaard Salts

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Possibility of superconducting precursor effects in quasi-one-dimensional organic conductors : theory and experiments

Cited by 59 publications

References 45 publications

Conduction anisotropy, Hall effect, and magnetoresistance of(TMTSF)2ReO4at high temperatures

Conduction anisotropy, Hall effect, and magnetoresistance of(TMTSF)2ReO4at high temperatures

Impurity-controlled superconductivity/spin density wave interplay in the organic superconductor: (TMTSF) 2 ClO 4

SO(4) Theory of Antiferromagnetism and Superconductivity in Bechgaard Salts

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Impurity-controlled superconductivity/spin density wave interplay in the organic superconductor: (TMTSF) ₂ ClO ₄