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Anomalous behavior of magneto-quantum oscillations in the organic superconductor κ-(BEDT-TTF)2I3

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Zeitschrift für Physik B Condensed Matter

Abstract

κ-(BEDT-TTF)2 I 3 is an extreme case of an electronically two-dimensional (2D) organic metal with a superconducting transition at around 4 K. In magnetic fields up to 27 T the field, angular and the temperature dependence of de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillation amplitudes were investigated. From the temperature dependence of the oscillation amplitudes the cyclotron effective massm * was investigated using Lifshitz-Kosevich formula (LK) and the surprising result is, thatm * appears to be magnetic field dependent as soon as the magnetic field is applied exactly perpendicular to the conducting planes so that the cyclotron orbit lies within those planes (i.e. Θ=0o) but field independent at Θ≠0o. It is shown that the LK formula can satisfactorily be used for the interpretation of all data obtained at Θ≠0o but not in the case where Θ=0o. An explanation of the anomalous data at Θ=0o can furthermore neither be given satisfactorily by the descriptions of magneto-quantum oscillations in 2D electronic systems nor by the occurrence of magnetic interaction effects (MI). Tentatively, the observed smaller oscillation amplitudes in κ-(BEDT-TTF)2 I 3 at Θ=0o above 12 T and below 1 K compared to the standard LK theory will be discussed in terms of a loss in the number of fermions by the occurrence of quasiparticles with fractional statistics.

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Authors and Affiliations

  1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, D-70550, Stuttgart, Germany

    E. Balthes & D. Schweitzer

  2. Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, D-69120, Heidelberg, Germany

    I. Heinen, H. J. Keller & W. Strunz

  3. Walther Meissner Institut, Walther-Meissner-Strasse 8, D-85748, Garching, Germany

    W. Biberacher

  4. High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, B.P. 166, F-38042, Grenoble Cedex, France

    A. G. M. Jansen & E. Steep

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  1. E. Balthes
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  2. D. Schweitzer
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  3. I. Heinen
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  4. H. J. Keller
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  5. W. Strunz
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  6. W. Biberacher
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  7. A. G. M. Jansen
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  8. E. Steep
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Balthes, E., Schweitzer, D., Heinen, I. et al. Anomalous behavior of magneto-quantum oscillations in the organic superconductor κ-(BEDT-TTF)2I3 . Z. Phys. B - Condensed Matter 99, 163–171 (1995). https://doi.org/10.1007/s002570050024

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  • DOI: https://doi.org/10.1007/s002570050024

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