Organic superconductors: The Bechgaard salts and relatives

Brown, Stuart

doi:10.1016/j.physc.2015.02.030

Cited by 43 publications

(35 citation statements)

References 119 publications

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“…As another example, in organic superconductors there is a strong influence of nonmagnetic impurities on Tc, see e. g. Joo et al [73] and the review by Brown [74].…”

Section: Superconductivity Is Extremely Sensitive To Impurities Non-mentioning

confidence: 99%

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Unconventional superconductivity

Stewart

2017

Advances in Physics

221

165

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Abstract:"Conventional" superconductivity, as used in this review, refers to electron-phonon coupled superconducting electron pairs described by BCS theory. Unconventional superconductivity refers to superconductors where the Cooper pairs are not bound together by phonon-exchange but instead by exchange of some other kind, e. g. spin fluctuations in a superconductor with magnetic order either coexistent or nearby in the phase diagram. Such unconventional superconductivity has been known experimentally since heavy fermion CeCu2Si2, with its strongly correlated 4f electrons, was discovered to superconduct below 0.6 K in 1979. Since the discovery of unconventional superconductivity in the layered cuprates in 1986, the study of these materials saw Tc jump to 164 K by 1994. Further progess in high temperature superconductivity would be aided by understanding the cause of such unconventional pairing. This review compares the fundamental properties of 9 unconventional superconducting classes of materialsfrom 4f-electron heavy fermions to organic superconductors to classes where only three known members exist to the cuprates with over 200 examples -with the hope that common features will emerge to help theory explain (and predict!) these phenomena. In addition, three new emerging classes of superconductors (topological, interfacial -e. g. FeSe on SrTiO3, and H2S under high pressure) are briefly covered, even though their "conventionality" is not yet fully determined.

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“…As another example, in organic superconductors there is a strong influence of nonmagnetic impurities on Tc, see e. g. Joo et al [73] and the review by Brown [74].…”

Section: Superconductivity Is Extremely Sensitive To Impurities Non-mentioning

confidence: 99%

“…There is apparently no pseudogap, 3 (Brown review [74]), and the small masses of crystals available prohibit neutron scattering investigations of a possible resonance, 4. Further, to date there are no phase sensitive determinations of the pairing symmetry, although there are STS measurements 7 as already mentioned.…”

Section: Dmentioning

confidence: 99%

Unconventional superconductivity

Stewart

2017

Advances in Physics

221

165

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“…5 and 7. It is worth stressing that NMR experiments for the temperature variation of the nuclear spin lattice relaxation rate have brought considerable evidence for the presence of spin fluctuations for both compounds in the same temperature range and their amplitude with pressure 25,28,29,41,61,62 .…”

Section: B the Bechgaard Salts (Tmtsf)2xmentioning

confidence: 99%

“…Such a systematic study is lacking so far. Following the example of previous electrical transport 27,63 and NMR studies 25,28,29,64 , it would be worthwhile to check if the Fermi liquid behaviour for the Seebeck coefficient is recovered sufficiently far above the quantum critical pressure.…”

Section: Summary and Concluding Remarksmentioning

confidence: 99%

“…This topic that has remained essentially unexplored so far 21 , will be the main focuss of the present work. The quantum critical behaviour of the Bechgaard salts is known to result from the juncture of a declining spindensity-wave (SDW) state with the onset of a superconducting (SC) dome under pressure [22][23][24][25][26] . The signatures of quantum criticality have been chiefly revealed by the observation of linear-T resistivity 27 , whose strength scales with the distance from the quantum critical point (QCP) along the pressure axis.…”

Section: Introductionmentioning

confidence: 99%

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Seebeck coefficient in correlated low-dimensional organic metals

Shahbazi

Bourbonnais

2016

Phys. Rev. B

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We study the influence of inelastic electron-electron scattering on the temperature variation of the Seebeck coefficient in the normal phase of quasi-one-dimensional organic superconductors. The theory is based on the numerical solution of the semi-classical Boltzmann equation for which the collision integral equation is solved with the aid of the electronic umklapp scattering vertex calculated by the renormalization group method. We show that the one-loop renormalization group flow of momentum and temperature dependent umklapp scattering, in the presence of nesting alterations of the Fermi surface, introduce electron-hole asymmetry in the energy dependence of the anisotropic scattering time. This is responsible for the enhancement of the Seebeck coefficient with respect to the band T -linear prediction and even its sign reversal around the quantum critical point of the phase diagram, namely where the interplay between antiferromagnetism and superconductivity along with the strength of spin fluctuations are the strongest. Comparison of the results with available data on low dimensional organic superconductors is presented and critically discussed.

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Controlled Growth and Chemical Engineering of FeSe‐Based Superconducting Films

Huang

Ren

2022

Advanced Physics Research

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Chemical engineering tailors functional materials to meet the demands of physical and chemical properties, accelerating materials discovery and design in a multidisciplinary field. However, stereotyped synthetic paradigms in physical and chemical approaches obstruct the effective integration of multiple advantages of respective materials exploration methods. Solid state reaction is often considered separately with wet chemistry synthesis route, such as film growth using physical vapor deposition and hydrothermal methods. Here, the controlled growth of FeSe thin films by physical deposition techniques followed by the chemical engineering to create heterogenous interface in FeSe films via a solution‐based environment is demonstrated. The two‐step route allows an expanded crystal structure and enhanced superconducting transition temperature from 3.6 to 38 K, providing a new strategy to design functional hybrid materials.

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Organic superconductors: The Bechgaard salts and relatives

Cited by 43 publications

References 119 publications

Unconventional superconductivity

Unconventional superconductivity

Seebeck coefficient in correlated low-dimensional organic metals

Controlled Growth and Chemical Engineering of FeSe‐Based Superconducting Films

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