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Unconventional field and angle dependences of the Shubnikov-de Haas oscillations spectra in the quasi two-dimensional organic superconductor (BEDO-TTF) 2ReO 4H 2O

  • C. Proust
  • A. Audouard
  • V. Laukhin
  • L. Brossard
  • M. Honold
  • M.-S. Nam
  • E. Haanappel
  • J. Singleton
  • N. Kushch

Abstract:

We report on the inter-layer oscillatory conductance of the two-dimensional organic superconductor (BEDO-TTF)2ReO4H2O measured in static and pulsed magnetic fields of up to 15 and 52 T, respectively. In agreement with previous in-plane studies, two Shubnikov-de Haas oscillation series linked to the two electron and the hole orbits are observed. The influence of the magnitude and orientation of the magnetic field with respect to the conducting plane is studied in the framework of the conventional two- and three-dimensional Lifshits-Kosevich (LK) model. Deviations of the data from this model are observed in low fields strongly tilted with respect to the normal to the conducting plane. In this latter case, the observed behaviour is consistent with an unexplained lowering of the cyclotron effective mass. At high magnetic field, the oscillatory data could have been compatible with the occurrence of a magnetic breakdown orbit built from the hole and electron orbits. However, the increase of the cyclotron effective mass, linked to the electron orbits, as the magnetic field increases above 12 T is consistent with a field-induced phase transition. In the lower field range, where the conventional LK model holds, the analysis of the angle dependence of the oscillations amplitude suggests significant renormalisation of the effective Landé factor.

PACS. 71.18.+y Fermi surface: calculations and measurements; effective mass, g factor – 74.70.Kn . Organic superconductors – 72.15.Gd . Galvanomagnetic and other magnetotransport effects 

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Copyright information

© EDP Sciences, Springer-Verlag 2001

Authors and Affiliations

  • C. Proust
    • 1
  • A. Audouard
    • 1
  • V. Laukhin
    • 2
  • L. Brossard
    • 1
  • M. Honold
    • 3
  • M.-S. Nam
    • 3
  • E. Haanappel
    • 1
  • J. Singleton
    • 3
  • N. Kushch
    • 2
  1. 1.Laboratoire de Physique de la Matière Condensée, Laboratoire National des Champs Magnétiques Pulsés, INSA, 135 avenue de Rangueil, 31077 Toulouse, FranceFR
  2. 2.Institute of Problems of Chemical Physics, RAS, Chernogolovka, MD 142432, Russian FederationRU
  3. 3.University of Oxford, Department of Physics, Clarendon Laboratory, OX1 3PU, UKGB

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