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

Abstract In quasi-one-dimensional organic conductors such as ( TMTSF ) 2 X ( X = ClO 4 , PF 6 , ReO 4 , etc.), the dips in the resistances along the most conducting axis ( ρ xx ) and the inter-chain axis ( ρ zz ) are observed at the so-called magic angles. Although the dips in ρ zz have been explained in terms of the commensurate semi-classical orbits in the momentum space, the origin of the large dips in ρ xx at magic angles is not clear. We study the angle-dependence of the conductivity along the most conducting axis, σ xx , by using a model neglecting electron correlation. We obtain that σ xx has small peaks at magic angles if we take account of the momentum-dependence of the Fermi velocity.