Magnetic Field Dependent Effective Mass in the Organic Superconductor κ-(BEDT-TTF)2I3 |
| E. Balthes, D. Schweitzer 3. Physik. Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany I. Heinen, H.J. Keller Anorg.-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270,. 69120 Heidelberg, Germany W. Biberacher Walther Meissner Institut, Walther-Meissner-Str. 8, 85748 Garching, Germany A.G.M. Jansen and E. Steep High Magnetic Field Laboratory, MPI für Festkörperforschung, 38042 Grenoble Cedex 9, France |
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| κ-(BEDT-TTF)2I3 is an electronically extreme two-dimensional organic metal with a superconducting transition at around 4 K. In magnetic fields above 12 T the effective mass, as obtained from the temperature dependence of the amplitudes of Shubnikov-de Haas oscillations, is magnetic field dependent as long as the magnetic field is arranged perpendicular to the conducting planes. In contrast to this, by turning the magnetic field by 27° or even only 9° the observed effective mass (as obtained from Shubnikov-de Haas and de Haas-van Alphen measurements) is field independent. We suppose that the occurrence of anyons at temperatures below 1 K in fields above 12 T is the reason for the observed field dependence of the effective mass. |
| DOI: 10.12693/APhysPolA.87.767 PACS numbers: 74.70.Kn, 71.25.Hc, 71.25.Jd |