Magnetic ordering and Fermi surface effects in the low-dimensional organic conductor α-(BEDT-TTF)2RbHg(SCN)4

Members of the family of low-dimensional organic conductors α-(BEDT-TTF) 2 MHg(SCN) 4 , with M=K, Rb, Tl, or NH 4 , have a Fermi surface (FS) consisting of both quasi-two-dimensional (Q2D) closed hole orbits and quasi-one-dimensional (Q1D) open orbits. The charge transfer salts with M=K, Rb, and Tl undergo an antiferro-magnetic ordering transition at about 10 K, which results in a density wave ground state. We have performed magnetoresistance (MR) measurements on α-(BEDT-TTF) 2 RbHg(SCN) 4 in order to understand details of the FS, and the nature of the interaction of the FS with the magnetic ordering in this material