Fermi-surface reconstruction in the organic conductor (BEDT-TTF)2TIHg(SCN)4

Abstract
Shubnikov-de Haas (SdH) measurements of the two-dimensional organic conductor (BEDT-TTF)2TIHg(SCN)4 have been performed in order to clarify the Fermi surface. At 0.05 K, in addition to the closed orbit and the magnetic breakdown orbit in the original Fermi surface,eight different SdH oscillations are found. All the frequencies follow the same angular dependence. The results are well explained in terms of the reconstruction of the Fermi surface due to spin density wave formation.