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Abstract:
We present both experimental data and an analytic theory for
the de Haas-van Alphen (dHvA) effect in the two-dimensional
organic single-crystal conductor kappa-(ET)(2)Cu(NCS)(2). We
show that the magnetization oscillation pattern and the fast
Fourier transform (FFT) spectrum of our measurements are well
described theoretically within the coherent magnetic breakdown
(MB) model for a two-dimensional Fermi surface consisting of
two open sheets and closed pockets connected by magnetic
breakdown centers. The spectrum of Landau quantized energy
levels changes substantially due to the MB. Landau bands
develop whose bandwidth and relative distance between them
oscillate in inverse magnetic field. These oscillations explain
the observed fine structure of the magnetization pattern at
fields above the MB field with the occurrence of "forbidden"
frequencies in the FFT spectrum.
