Regensburg 2002 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 22: Postersitzung III: Syst. korr. Elektr.: Theorie II (1-15), Metall-Isol.- und Phasenüberg
änge (16-33), SL: Massivmat., Bandl., Pinning, Vortexdyn., Transport, Korngr. (34-43), Niedrigdim. Syst., Magnetotransport (44-63)

TT 22.50: Poster

Donnerstag, 14. März 2002, 14:00–17:30, A

Electron correlation in the 2D organic metal κ-(BEDT-TTF)₂I₃ — •Eduard Balthes^1,2, Dieter Schweitzer¹, and Peter Wyder² — ¹3. Phys. Inst. der Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart — ²Hochfeldmagnetlabor MPI - FKF, BP 166, F-38042 Grenoble / Frankreich

In the two-dimensional (2D) multilayer organic metal κ-(BEDT-TTF)₂I₃ (BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene) strong electron correlations are present at magnetic fields B > 12T and temperatures T < 1K. These correlations manifest themselves as strong anomalous damping effects of magnetoquantum oscillations (QOs) at high magnetic fields, which are controlled by the low Landau level filling factors ν < 3 in a part of the Fermi surface. It is found that the electron correlations capture all electrons of the FS, including even the parts with very high ν. Considering the strong two-dimensionality of the electronic system these effects and further results are discussed in terms of the presence of electron localization in the organic metal κ-(BEDT-TTF)₂I₃, as given in the integer and fractional quantum Hall effects observed in 2D semiconductors at low ν.