High field Fermi surfaces studied by AMRO in η-Mo4O11

The high field Fermi surface in eta-Mo4O11 at low temperatures has been studied by the Angle-dependent Magnetoresistance Oscillation (AMMO) method (Organic Super Conductors, Springer, Berlin, 1998, p. 455). The Shubnikov-de Haas (SdH) oscillation so far obtained shows existence of the several closed surfaces, but the results only give the area of the pockets. The AMMO result at high fields in the plane perpendicular to the crystal b-axis shows the angle-dependent resistance oscillation together with the SdH oscillations. We see no clear AMMO for the fields in the plane perpendicular to the c-axis. The results indicate the existence of very anisotropic Fermi surfaces, which are expected from the Fermi surface model (Chem. Rev. 91 (1991) 965) taking into account the lower temperature CDW nesting vector q(2). (C) 2002 Elsevier Science B.V. All rights reserved.