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Transport Properties of Single Crystals and Polycrystalline Pressed Samples of (BEDT-TTF)2X Salts and Related Coordination Polymers

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Lower-Dimensional Systems and Molecular Electronics

Part of the book series: NATO ASI Series ((NSSB,volume 248))

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Abstract

Ten years ago, in 1979, superconductivity was observed for the first time in an organic metal [1]. Today, about 30 different organic metals are known, which become superconducting under pressure or ambient pressure. The organic superconductors with the highest transition temperatures are all radical salts of the donor bis(ethylenedithiolo)-tetrathiafulvalene (BEDT-TTF), namely at ambient pressure (BEDT-TTF)2Cu(NCS)2 (Tc = 10.4 K) [2] and αt-(BEDT-TTF)2I3 (Tc = 8 K) [3] and under isotropic pressure βH - (BEDT-TTF)2I3 (0.5 kbar, Tc = 7.5 K) [4,5]. The latter βH-phase can even become superconducting at 8 K and ambient pressure, after a special pressure-temperature cycling procedure [6], i.e. pressurization up to 1 kbar at room temperature, and release of the helium gas pressure at temperatures below 125 K. Nevertheless, this superconducting state at 8 K in βH-(BEDT-TTF)2I3 is only metastable [6,7], since warming up the crystal above 125 K, and cooling down again under ambient pressure, results only in superconductivity at 1.3 K, the so-called βL - or β-phase.

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Author information

Authors and Affiliations

  1. 3. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 7000, Stuttgart 80, Federal Republic of Germany

    D. Schweitzer & S. Kahlich

  2. Max-Planck Institut für Medizinische Forschung, AG: Molekülkristalle, Jahnstraße 29, 6900, Heidelberg, Federal Republic of Germany

    S. Gärtner, E. Gogu, H. Grimm, I. Heinen, T. Klutz & R. Zamboni

  3. Anorganisch Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 6900, Heidelberg, Federal Republic of Germany

    H. J. Keller & G. Renner

  4. Istituto di Spettroscopia Molecolare, C.N.R., Bologna, Italy

    R. Zamboni

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  1. D. Schweitzer
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Editors and Affiliations

  1. The University of Alabama, Tuscaloosa, Alabama, USA

    Robert M. Metzger

  2. Institut Laue-Langevin, Grenoble, France

    Peter Day

  3. National Hellenic Research Foundation, Athens, Greece

    George C. Papavassiliou

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Schweitzer, D. et al. (1990). Transport Properties of Single Crystals and Polycrystalline Pressed Samples of (BEDT-TTF)2X Salts and Related Coordination Polymers. In: Metzger, R.M., Day, P., Papavassiliou, G.C. (eds) Lower-Dimensional Systems and Molecular Electronics. NATO ASI Series, vol 248. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2088-1_7

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  • DOI: https://doi.org/10.1007/978-1-4899-2088-1_7

  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-1-4899-2090-4

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