Volume 51, Number 1, July I 2000
|Page(s)||82 - 88|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 September 2002|
Investigations of the Fermi surface of a new organic metal: (BEDT-TTF)4[ Ni(dto)
3. Physichalisches Institut, Universität Stuttgart
Pfaffenwaldring 57, 70550 Stuttgart, Germany
2 High Magnetic Field Laboratory MPI-FKF and CNRS, BP 166, F-38042 Grenoble Cedex 9, France
3 Department of Chemistry, North Carolina State University Raleigh, North Carolina 27695, USA
4 Anorganisch-Chemisches Institut, Universität Heidelberg Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
Accepted: 10 May 2000
The Fermi surface (FS) of the new organic metal (BEDT-TTF)4[ Ni(dto) has been investigated by de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) experiments. In both quantum oscillations with two different frequencies = 634 T and = 4245 T are observed. These results confirm the calculated FS, which consists of one-dimensional and two-dimensional parts separated by a small energy gap. It is shown that the temperature and field dependence of the oscillation amplitudes can be well described by standard Lifshitz-Kosevich theory considering the magnetic breakdown by the so-called coupled network model. Beatings of the oscillation amplitudes are observed by field-dependent dHvA and SdH experiments. They can be explained by a slightly warped FS showing that this material represents a quasi–two-dimensional electronic system. The observed beating nodes in the dHvA and SdH signals appear at different magnetic fields. This fact is discussed in terms of additional scattering mechanisms.
PACS: 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor / 71.20.Rv – Polymers and organic compounds / 72.15.Gd – Galvanomagnetic and other magnetotransport effects
© EDP Sciences, 2000
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