Insulating, conducting and superconducting states of (TMTSF)2AsF6 under pressure and magnetic field

Brusetti, R.; Ribault, M.; Jérôme, D.; Bechgaard, K.

doi:10.1051/jphys:01982004305080100

Cited by 90 publications

(46 citation statements)

References 23 publications

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“…13 It should be mentioned here that X-ray diffuse scattering experiments have revealed a coexistence of 2k F charge density wave (CDW) in the SDW phase for X=PF 6 , 14, 15 while the amplitude of the 2k F CDW is very small for X=AsF 6 .…”

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confidence: 99%

Pairing Symmetry Competition in Organic Superconductors

Kuroki

2006

J. Phys. Soc. Jpn.

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A review is given on theoretical studies concerning the pairing symmetry in organic superconductors. In particular, we focus on (TMTSF)2X and κ-(BEDT-TTF)2X, in which the pairing symmetry has been extensively studied both experimentally and theoretically. Possibilities of various pairing symmetry candidates and their possible microscopic origin are discussed. Also some tests for determining the actual pairing symmtery are surveyed.

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confidence: 99%

Pairing Symmetry Competition in Organic Superconductors

Kuroki

2006

J. Phys. Soc. Jpn.

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“…[21][22][23][24] Insulator to superconductor transition as a function of pressure has also been found for ͑TMTSF͒ 2 AsF 6 (Ref. 25) and ͑TMTTF͒ 2 PF 6 . 26 There are two aspects of the SO(4) symmetry between antiferromagnetism and triplet superconductivity that we address in this paper.…”

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confidence: 85%

Competition between triplet superconductivity and antiferromagnetism in quasi-one-dimensional electron systems

Podolsky¹,

Altman²,

Rostunov³

et al. 2004

Phys. Rev. B

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We investigate the competition between antiferromagnetism and triplet superconductivity in quasi-onedimensional electron systems. We show that the two order parameters can be unified using a SO(4) symmetry and demonstrate the existence of such symmetry in one-dimensional Luttinger liquids of interacting electrons. We argue that approximate SO(4) symmetry remains valid even when interchain hopping is strong enough to turn the system into a strongly anisotropic Fermi liquid. For unitary triplet superconductors SO(4) symmetry requires a first order transition between antiferromagnetic and superconducting phases. Analysis of thermal fluctuations shows that the transition between the normal and the superconducting phases is weakly first order, and the normal to antiferromagnet phase boundary has a tricritical point, with the transition being first order in the vicinity of the superconducting phase. We propose that this phase diagram explains coexistence regions between the superconducting and the antiferromagnetic phases, and between the antiferromagnetic and the normal phases observed in ͑TMTSF͒ 2 PF 6 . For nonunitary triplet superconductors the SO(4) symmetry predicts the existence of a mixed phase of antiferromagnetism and superconductivity. We discuss experimental tests of the SO(4) symmetry in neutron scattering and tunneling experiments.

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“…As it was pointed out in [2], the standard renormalization group (RG) analysis is not applicable for superconductivity QCP and theoretical models for AFM with nesting features because no expansion in a form of a Landau functional is possible near QCP at T = 0 in these cases. QCP with increase in pressure have been observed for SDW in the Bechgaard salts (TMTSF) 2 X (with X=PF 6 [3], AsF 6 [4]) and recently investigated in many details in [1]. According to [1], the phase diagram of (TMTSF) 2 PF 6 near its critical pressure, p c ∼ 9.4kbar, indeed, has a rather complicated character.…”

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Soliton phase near antiferromagnetic quantum critical point in Q1D conductors

Gor’kov

Grigoriev

2005

Europhys. Lett.

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In frameworks of a nesting model for Q1D organic conductor at the antiferromagnetic (SDW) quantum critical point the first-order transition separates metallic state from the soliton phase having the periodic domain structure. The low temperature phase diagram also displays the 2nd-order transition line between the soliton and the uniformly gapped SDW phases. The results agree with the phase diagram of (TMTSF)2PF6 near critical pressure [T. Vuletic et al., Eur. Phys. J. B 25, 319 (2002)]. Detection of the 2nd-order transition line is discussed. We comment on superconductivity at low temperature.PACS numbers: 71.30.+h, 74.70.Kn, 75.30.Fv We address the issue of quantum critical point (QCP) for the itinerant antiferromagnetism (AFM) (also known as spin-density wave state (SDW)) in Q1D compounds. As it was pointed out in [2], the standard renormalization group (RG) analysis is not applicable for superconductivity QCP and theoretical models for AFM with nesting features because no expansion in a form of a Landau functional is possible near QCP at T = 0 in these cases. QCP with increase in pressure have been observed for SDW in the Bechgaard salts (TMTSF) 2 X (with X=PF 6 [3], AsF 6 [4]) and recently investigated in many details in [1]. According to [1], the phase diagram of (TMTSF) 2 PF 6 near its critical pressure, p c ∼ 9.4kbar, indeed, has a rather complicated character. However, the experimental fact that the transition from metallic to SDW state is of the first order suggests that quantum fluctuations do not play decisive role near p c , and the overall phase diagram near p c for (TMTSF) 2 PF 6 can be understood already on a mean field level.The most unexpected finding in [1] is the discovery of a pressure interval below p c , where SDW and metal phases (SDW and superconductivity (SC) at lower T ) coexist as parallel domains running perpendicular to the chain direction. Such coexistence is difficult to understand for the 1st order transition that takes place at constant pressure [1]. In what follows we propose that such domains can be interpreted as formation of a new phase of the soliton walls suggested first theoretically for the Q1D electron spectrum in [5,6,7]. Domains inside the SDW interval were also observed in [8]. We shall see that it is rather natural to expect SC in these domains at lower temperature. In this presentation we restrict ourselves mainly by the effects related to the physics of SDW. Superconductivity appears at lower temperature than the onset of the SDW/metal phase transition, and we only comment on it at the end.For the SDW description we adopt the standard Q1D model of two open Fermi surface (FS) sheets with the energy spectrum of free electrons in the form:with dispersion in the direction perpendicular to theThe conditionis assumed to conserve the number of electrons. The angular brackets mean averaging over p ⊥ : where u(Q) has a maximum at some Q 0 . Interaction (5) is renormalized after summing up the ladder diagrams:

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Insulating, conducting and superconducting states of (TMTSF)2AsF6 under pressure and magnetic field

Cited by 90 publications

References 23 publications

Pairing Symmetry Competition in Organic Superconductors

Pairing Symmetry Competition in Organic Superconductors

Competition between triplet superconductivity and antiferromagnetism in quasi-one-dimensional electron systems

Soliton phase near antiferromagnetic quantum critical point in Q1D conductors

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