Correlation effects in ET compounds

Louati, R.; Charfi‐Kaddour, S.; Ali, Amir; Bennaceur, R.; Héritier, M.

doi:10.1016/s0379-6779(98)00257-4

Cited by 25 publications

(21 citation statements)

References 8 publications

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“…In the superclean limit the θ-dependence comes from that of the density of states, while in the clean limit this arises from the short range cut-off we have introduced after Eq. (10). Also this angular dependence is very similar to the one reported in [13], but of opposite sign.…”

Section: Thermal Conductivity Tensorsupporting

confidence: 84%

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Quasi-particle transport in vortex state of nodal superconductors

Won

Maki

2001

Current Applied Physics

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Quasiparticle spectrum associated with the nodal structure in d-wave superconductors is of great interest. We study theoretically the quasi-particle spectrum in a planar magnetic field, where the effect of the magnetic field is treated in terms of the Doppler shift. We obtain the angular dependent specific heat in the presence of a planar magnetic field and impurities, both in the superclean limit(≪ 1) and in the clean limit(. Also a similar analysis is used for the thermal conductivity tensor within the a-b plane. In particular, in contrast to the earlier works, we find a fourfold symmetry term in κ and κ ⊥ ∼ −H sin(2θ) where κ and κ ⊥ are the diagonal-and the off-diagonal components of the thermal conductivity tensor and θ is the angle between the heat current and the magnetic field.

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Section: Thermal Conductivity Tensorsupporting

confidence: 84%

“…Also uncertain is the nodal directions of the order parameter 6,7 in κ-(ET) 2 salts in spite of the theoretical suggestion that it belongs to d xy -symmetry. [8][9][10] In this circumstance, the experimental probe which indicates the nodal directions in d-wave superconductors is of prime importance.…”

Section: Introductionmentioning

confidence: 99%

Quasi-particle transport in vortex state of nodal superconductors

Won

Maki

2001

Current Applied Physics

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“…Further support for the importance of antiferromagnetic fluctuations has emerged from theoretical calculations which are able to predict the behaviour of 1/T 1 as a function of temperature [47]. Similarly, using a two-band description of the antibonding orbitals on a BEDT-TTF dimer and and intermediate local Coulomb repulsion between two holes on one dimer, Schmalian [5] was able to determine the magnetic interaction and superconducting gap functions of a typical κ-phase BEDT-TTF salt within the fluctuation-exchange approximation (see also References [98,4]).…”

Section: Summary Of Fermi-surface and Quasiparticle Propertiesmentioning

confidence: 99%

Quasi-two-dimensional organic superconductors: A review

Singleton¹,

Mielke²

2002

Contemporary Physics

180

194

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Abstract. We present a review of quasi-two-dimensional organic superconductors. These systems exhibit many interesting phenomena, including reduced dimensionality, strong electron-electron and electron-phonon interactions and the proximity of antiferromagnetism, insulator states and superconductivity. Moreover, it has been possible to measure the electronic bands of many of the organics in great detail, in contrast to the situation in other well-known systems in which similar phenomena occur. We describe the crystal structure and normal-state properties of the organics, before presenting the experimental evidence for and against exotic superconductivity mediated by antiferromagnetic fluctuations. Finally, three instances of field-induced unconventional superconductivity will be described.

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“…Whilst nuclear magnetic resonance [5], penetration-depth [2], tunnelling [4] and other experiments [1] appear to suggest that the superconductivity in these salts may be d-wave-like and mediated by spin-density-wave-like fluctuations, some doubts have been cast by recent controversial specific heat measurements, which may suggest that the order parameter does not possess the required nodes [3]. Several theories [6,7,8,9] stress the importance of the details of the Fermi-surface topology in providing suitable prerequisites for superconductivity; if the Fermi-surface geometry and interactions are altered slightly, it appears that BCS-like s-wave superconductivity may be the dominant low-temperature groundstate [1].…”

Section: Introductionmentioning

confidence: 99%

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)₂GaCl₄(BETS≡bis(ethylene-dithio)tetraselenafulvalene)

Mielke

Singleton

Nam

et al. 2001

J. Phys.: Condens. Matter

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Abstract. The Fermi surface topology of the organic superconductor λ-(BETS) 2 GaCl 4 has been determined using the Shubnikov-de Haas and magnetic breakdown effects and angle-dependent magnetoresistance oscillations. The former experiments were carried out in pulsed fields of up to 60 T, whereas the latter employed quasistatic fields of up to 30 T. All of these data show that the Fermi-surface topology of λ-(BETS) 2 GaCl 4 is very similar to that of the most heavily-studied organic superconductor, κ-(BEDT-TTF) 2 Cu(NCS) 2 , except in one important respect; the interplane transfer integral in λ-(BETS) 2 GaCl 4 is a factor ∼ 5 larger than that in κ-(BEDT-TTF) 2 Cu(NCS) 2 . The increased three-dimensionality of λ-(BETS) 2 GaCl 4 is manifested in radiofrequency penetration-depth measurements, which show a clear dimensional crossover in the behaviour of H c2 (T ). The radiofrequency measurements have also been used to extract the Labusch parameter determining the fluxoid interactions as a function of temperature, and to map the flux-lattice melting curve.

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Correlation effects in ET compounds

Cited by 25 publications

References 8 publications

Quasi-particle transport in vortex state of nodal superconductors

Quasi-particle transport in vortex state of nodal superconductors

Quasi-two-dimensional organic superconductors: A review

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)₂GaCl₄(BETS≡bis(ethylene-dithio)tetraselenafulvalene)

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Correlation effects in ET compounds

Cited by 25 publications

References 8 publications

Quasi-particle transport in vortex state of nodal superconductors

Quasi-particle transport in vortex state of nodal superconductors

Quasi-two-dimensional organic superconductors: A review

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)2GaCl4(BETS≡bis(ethylene-dithio)tetraselenafulvalene)

Contact Info

Product

Resources

About

Superconducting properties and Fermi-surface topology of the quasi-two-dimensional organic superconductor λ-(BETS)₂GaCl₄(BETS≡bis(ethylene-dithio)tetraselenafulvalene)