Abstract
The change of the de Haas–van Alphen (dHvA) oscillation between the low-field spin-density-wave (SDW) phase and the high-field ( H⩾23 T) metallic phase of the organic conductor α-(BEDT-TTF) 2KHg(SCN) 4 is explained in terms of a model of the magnetic breakdown (MB) and a reconstructed Fermi surface by SDW. On the reconstructed Fermi surface, the scattering time obtained by fitting the standard Lifshitz–Kosevich formulation to the dHvA oscillations is affected by the MB giving the additional field-dependent effect. Furthermore, the evaluation of the effective mass needs to consider the additional temperature-dependent factor being due to the MB gap which may change intrinsically and/or thermally with temperature.
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