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Quasiparticles and Fermi liquid behaviour in an organic metal

Author

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  • T. Kiss

    (Institute for Solid State Physics (ISSP), University of Tokyo
    The Institute of Physical and Chemical Research (RIKEN)
    CREST, JST
    Present address: Graduate school of engineering science, Osaka University, Toyonaka, Osaka 560-8531, Japan;)

  • A. Chainani

    (The Institute of Physical and Chemical Research (RIKEN))

  • H.M. Yamamoto

    (The Institute of Physical and Chemical Research (RIKEN)
    JST-PRESTO
    Institute for Molecular Science)

  • T. Miyazaki

    (National Institute for Materials Science)

  • T. Akimoto

    (Institute for Solid State Physics (ISSP), University of Tokyo)

  • T. Shimojima

    (Institute for Solid State Physics (ISSP), University of Tokyo
    Present address: Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.)

  • K. Ishizaka

    (Institute for Solid State Physics (ISSP), University of Tokyo
    CREST, JST
    Present address: Department of Applied Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan.)

  • S. Watanabe

    (Institute for Solid State Physics (ISSP), University of Tokyo)

  • C.-T. Chen

    (Beijing Center for Crystal R&D, Chinese Academy of Science)

  • A. Fukaya

    (The Institute of Physical and Chemical Research (RIKEN))

  • R. Kato

    (The Institute of Physical and Chemical Research (RIKEN))

  • S. Shin

    (Institute for Solid State Physics (ISSP), University of Tokyo
    CREST, JST
    The Institute of Physical and Chemical Research (RIKEN))

Abstract

Many organic metals display exotic properties such as superconductivity, spin-charge separation and so on and have been described as quasi-one-dimensional Luttinger liquids. However, a genuine Fermi liquid behaviour with quasiparticles and Fermi surfaces have not been reported to date for any organic metal. Here, we report the experimental Fermi surface and band structure of an organic metal (BEDT-TTF)3Br(pBIB) obtained using angle-resolved photoelectron spectroscopy, and show its consistency with first-principles band structure calculations. Our results reveal a quasiparticle renormalization at low energy scales (effective mass m*=1.9 me) and ω2 dependence of the imaginary part of the self energy, limited by a kink at ~50 meV arising from coupling to molecular vibrations. The study unambiguously proves that (BEDT-TTF)3Br(pBIB) is a quasi-2D organic Fermi liquid with a Fermi surface consistent with Shubnikov-de Haas results.

Suggested Citation

  • T. Kiss & A. Chainani & H.M. Yamamoto & T. Miyazaki & T. Akimoto & T. Shimojima & K. Ishizaka & S. Watanabe & C.-T. Chen & A. Fukaya & R. Kato & S. Shin, 2012. "Quasiparticles and Fermi liquid behaviour in an organic metal," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2079
    DOI: 10.1038/ncomms2079
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