Angle-dependent magneto-resistance in the quasi-one-dimensional system

In quasi-one-dimensional organic conductors such as (TMTSF)(2)X (X = ClO4, PF6, ReO4, CtO, the dips in the resistances along the most conducting axis (p(zz)) and the inter-chain axis (p(zz)) are observed at the so-called magic angles. Although the dips in p,(zz) have been explained in terms of the commensurate semi-classical orbits in the momentum space, the origin of the large dips in p(xx) at magic angles is not clear. We study the angle-dependence of the conductivity along the most conducting axis, sigma(xx), by using a model neglecting electron correlation. We obtain that sigma(xx) has small peaks at magic angles if we take account of the momentum-dependence of the Fermi velocity. (c) 2006 Elsevier B.V. All rights reserved.