Organic Superconductors

Lang, Michael; Müller, Jens

doi:10.1007/978-3-540-73253-2_20

Cited by 9 publications

(15 citation statements)

References 345 publications

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“…Since the discovery of superconductivity in its iodide salts, about 25 years ago, , the bis(ethylene-dithio)-tetrathiafulvalene (BEDT-TTF) molecule (Scheme ) and its variants have remained the most important structure in the field of organic superconductors. It is practically impossible to refer to the huge number of papers that has been devoted to the characterization of this molecule and its salts, to the point one may doubt there is still something to discover . I will show here that this is not the case.…”

Section: Introductionmentioning

confidence: 76%

Charge Sensitive Vibrations and Electron-Molecular Vibration Coupling in Bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF)

Girlando

2011

J. Phys. Chem. C

108

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A complete analysis of the vibrational dynamics of the most important molecule in the field of organic superconductors, bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF), has been performed through first-principles calculations. Different ionization states have been investigated, both as isolated BEDT-TTF unit, and as symmetric self-dimer. The ionization process affects the frequencies of some vibrations, the "charge sensitive modes", but also their intensities. In particular, a 100-fold increase in the infrared intensity of the antisymmetric CdC stretching mode is predicted to occur upon removal of one electron. The discovery of this dramatic difference will help to interpret the spectral phenomena observed in correspondence to the charge-order processes undergone by some BEDT-TTF salts. The electronmolecular vibration (e-mv) coupling and its effects on the infrared spectra is also fully reanalysed by adopting the proper molecular symmetry of the BEDT-TTF + monomer, and by investigating (BEDT-TTF) 2 2+ and (BEDT-TTF) 2 + dimers. A new approach to estimate the relative values of the e-mv coupling constants is proposed.

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Section: Introductionmentioning

confidence: 76%

Charge Sensitive Vibrations and Electron-Molecular Vibration Coupling in Bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF)

Girlando

2011

J. Phys. Chem. C

108

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“…For H applied within the ET planes, H c2 often exceeds the Pauli paramagnetic limit [26,27] and evidence for the Fulde-Ferrell-Larkin-Ovchinnikov state may be found, as will be discussed below. The moderately low upper critical fields allow, in contrast to the cuprate high-T c superconductors, to access conveniently the whole superconducting phase diagram and to study the rich physics of the vortex phase [4,5]. In the following, some selected experimental features observed for the organic superconductors are presented.…”

Section: Properties Of the Superconducting Statementioning

confidence: 99%

“…On the other hand, there exist numerous studies pointing towards a complete s-wave-like superconducting gap. These issues are discussed in the excellent review by Lang and Müller [5]. For further discussion of this topic see References [4,7,[12][13][14][15]30].…”

Section: Nature Of the Superconducting Statementioning

confidence: 99%

“…Clear-cut experimental proof for unconventional non-BCS-like superconductivity, such as phase-sensitive experimental evidence, is missing. For the organic superconductors, where singlet pairing has been established, the experimental picture on the symmetry of the order parameter is still diverse (see [4,5,[12][13][14][15] for recent reviews). Some results hint at line nodes in the superconducting energy gap, i.e., d-wave symmetry, whereas other experiments, in particular, specific-heat data, suggest the existence of a nodeless energy gap, fully consistent with BCS-like s-wave symmetry.…”

Section: Introductionmentioning

confidence: 99%

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Superconductivity in Layered Organic Metals

Wosnitza

2012

Crystals

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In this short review, I will give an overview on the current understanding of the superconductivity in quasi-two-dimensional organic metals. Thereby, I will focus on charge-transfer salts based on bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or ET for short). In these materials, strong electronic correlations are clearly evident, resulting in unique phase diagrams. The layered crystallographic structure leads to highly anisotropic electronic as well as superconducting properties. The corresponding very high orbital critical field for in-plane magnetic-field alignment allows for the occurrence of the Fulde-FerrellLarkin-Ovchinnikov state as evidenced by thermodynamic measurements. The experimental picture on the nature of the superconducting state is still controversial with evidence both for unconventional as well as for BCS-like superconductivity.

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“…There are a wide variety of unconventional superconductors which, to some extent or another, involve strong ferromagnetic (FM) spin correlations. Examples include uranium-based heavy fermion materials [4,5] which lie close to a FM quantum critical point, candidate low-dimensional triplet superconductors such as the Bechgaard salts [6], twisted double bilayer graphene, [7,8] and various transition metal superconductors [9,10], notably the iron-based and ruthenate superconductors, which as Hund's metals involve strong local FM correlations between orbitals. Various papers have speculated that the Hund's interactions might provide the origin of the pairing in these systems [11][12][13][14][15][16].…”

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confidence: 99%

The Triplet Resonating Valence Bond State and Superconductivity in Hund's Metals

Coleman,

Komijani,

König

2019

Preprint

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A central idea in strongly correlated systems is that doping a Mott insulator leads to a superconductor by transforming the resonating valence bonds (RVBs) into spinsinglet Cooper pairs. Here, we argue that a spin-triplet RVB (tRVB) state, driven by spatially, or orbitally anisotropic ferromagnetic interactions can provide the parent state for triplet superconductivity. We apply this idea to the iron-based superconductors, arguing that strong onsite Hund's interactions develop intra-atomic tRVBs between the t 2g orbitals. On doping, the presence of two iron atoms per unit cell allows these inter-orbital triplets to coherently delocalize onto the Fermi surface, giving rise to a fully gapped triplet superconductor with a staggered structure of onsite pair correlations, detectable as an alternating π phase shift in a scanning Josephson tunnelling microscope.

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Organic Superconductors

Cited by 9 publications

References 345 publications

Charge Sensitive Vibrations and Electron-Molecular Vibration Coupling in Bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF)

Charge Sensitive Vibrations and Electron-Molecular Vibration Coupling in Bis(ethylenedithio)-tetrathiafulvalene (BEDT-TTF)

Superconductivity in Layered Organic Metals

The Triplet Resonating Valence Bond State and Superconductivity in Hund's Metals

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