New, organic, volume superconductor at ambient pressure

Schwenk, H.; Heidmann, C.-P.; Groß, F.; Hess, E.; Andres, K.; Schweitzer, Dieter; Keller, Heimo J.

doi:10.1103/physrevb.31.3138

Cited by 58 publications

(14 citation statements)

References 7 publications

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“…Kbar, but no sign of superconductivity could be observed down to 100 mK [16]. This 135 K transition is a first order phase transition as shown by a differential thermal analysis [17].…”

Section: Why Beot -Ttfs?mentioning

confidence: 89%

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Electrochemically Prepared Radical Salts of BEDT‐TTF: Molecular Metals and Superconductors

Schweitzer

Gogu

Hennig

et al. 1987

Ber Bunsenges Phys Chem

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The structural, electronic and superconducling properties of several electrochemically prepared BEDT -ITF radical salts arc discussed. InlroduclionSince the observation of superconductivity at temperatures up 10 100 K in the metal oxides of the type Ba~La$ _~CUS05(l _ '1 first discovered by Bednarz and Muller [I] superconductivity bas attracted again a lot of interest. A1though the theoretical understanding of .the mechanism leading to superconductivity in these materials is not quite clear yet the most important point is that this discovery has shown that high temperature superconductivity is experimentally achievable.The idea of high temperature superconductivity is quite old. In 1964 Little proposed a model of a metalorganic superconductor at room temperature [2]. His idea has stimulated a lot of interesting developments in the field of lowdimensional conductors. Nevertheless, up to now no high temperature organic superconductor exists. It took a lot of work until 1980 berore superconductivity at 1.3 K under an isotropic pressure of 12 kbar could be observed in an organic material for the first time [3J. At this moment the highest transition temperature into a stable superconducting state at ambient pressure in an organic metal lies at 8 K [4]. The recent finding of higb temperolture superconductivity in the metal oxides will certainly strongly stimulate furtber syntbetic efforts in the search for other organic metals with higher superconducting transition temperatures.On the other hand the understanding of the electronic and superconducting properties of the existing organic metals and especiaUy their relation to the molecular structures of these materials is a prerequisite for further directed developments. The electronic properties of different radical salts obtained from the organic donor bisethyleneditbiolotetrathiafulvalene (BEDT -TIf) by electrochemical methods in tbe presence of II anions [5] are Quite well understood. In addition their crystal structures have been studied over a broad temperature range. The relation of the superconducting properties of these organic metals to their typical crystal structures and especially to small structural cbanges due to phase transitions is known in detail, therefore. In the following a review of the structural, electronic and superconducting properties of the organic metals a-, P-and tXt-{BEDT -TTFhIJ is given.

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“…Kbar, but no sign of superconductivity could be observed down to 100 mK [16]. This 135 K transition is a first order phase transition as shown by a differential thermal analysis [17].…”

Section: Why Beot -Ttfs?mentioning

confidence: 89%

“…[18]. Meissner effect measurements [19] demonstrated tbe bulk property of the superconductivity in these crystals. A short time later it was found tbal under a pressure of 1.3 kbar the superconducting transition in f}-phasc crystals can be raised to 7.5 K [20,21].…”

Section: Il-(bedt -Ttf)2ijmentioning

confidence: 99%

Electrochemically Prepared Radical Salts of BEDT‐TTF: Molecular Metals and Superconductors

Schweitzer

Gogu

Hennig

et al. 1987

Ber Bunsenges Phys Chem

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“…In addition, the superconducting properties of the organics, such as the critical fields and the coherence length, are often anisotropic. For example, the triclinic compound βÀ(ET) 2 I 3 has lower critical fields B c1 5 5, 9, and 36 μT along the a, b, and c crystallographic directions, respectively, and corresponding upper critical fields B c2 5 1.78, 1.70, and 0.08 T (Schwenk et al, 1985;Tokumoto et al, 1985). The coherence lengths are (ξ) plane 5 350 Å in the conducting plane and (ξ) \ 5 23 Å (Ishiguro and Yamaji, 1990, p. 260).…”

Section: Charge-transfer Organicsmentioning

confidence: 99%

Noncuprate superconductors

Poole

2014

Superconductivity

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“…One of the early organic metals, a perylene-iodine complex, exhibited various stoichiometies and conductivities (1,2). Further research on a variety of organic conductors has led to the importance of obtaining segregated stacks, partial charge transfer, extensive IT-overlap between adjacent molecules in the cation or anion columns (2), leading finally to the discovery of the ambient pressure low temperature organic superconductors (TMTSF),C104 (3) and (BEDT-l'TF)*13 (4)(5)(6), the latter containing the 13-anion as a counterion.…”

Section: Introductionmentioning

confidence: 99%

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I_2.5•TCNQ

Bandrauk¹,

Truong²,

Carlone³

1989

Can. J. Chem.

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Can. J. Chem. 67,619 (1989). A new semiconducting ternary compound of stoichiometry TEDA.12.5.TCNQ is reported. The crystal is made up of linear chains of TCNQ-"2, nonlinear chains of 13-, and monodides of doubly charged triethylenediamines (TEDA). Half the TEDA's are hydrogen bonded to the TCNQ's and 13-. The conductivity measurements indicate semiconducting behaviour with two discontinuities in activation energy, one at high (330 K) and the other at low (1 60 K) temperatures. Resonance Raman spectra of the crystals manifest strong resonance enhancement of the iodide moieties. In particular, selective resonance excitation at 647 nrn of nonsymmetric 13-is observed, thus indicating an increasing asymmetry of the 13-in the low temperature phase and suggesting coupling between the three species in this phase.

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New, organic, volume superconductor at ambient pressure

Cited by 58 publications

References 7 publications

Electrochemically Prepared Radical Salts of BEDT‐TTF: Molecular Metals and Superconductors

Electrochemically Prepared Radical Salts of BEDT‐TTF: Molecular Metals and Superconductors

Noncuprate superconductors

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I_2.5•TCNQ

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New, organic, volume superconductor at ambient pressure

Cited by 58 publications

References 7 publications

Electrochemically Prepared Radical Salts of BEDT‐TTF: Molecular Metals and Superconductors

Electrochemically Prepared Radical Salts of BEDT‐TTF: Molecular Metals and Superconductors

Noncuprate superconductors

Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I2.5•TCNQ

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Product

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Properties of a new one-dimensional semiconducting ternary compound: TEDA (triethylenediamine)•I_2.5•TCNQ