Semiclassical and non-classical angular effects of magnetoresistance in (TMTSF)2X

We have studied the semiclassical and non-semiclassical behaviors of magnetoresistance (MR) in a quasi-one-dimensional (Q1D) conductor (TMTSF)2ClO4. Based on the Boltzmann equation, we numerically investigated possible semiclassical “angular effects”, the characteristic patterns of the field-orientation-dependence of MR, in the general Q1D conductors. Particularly, we have clarified the complicated situation around B//1D-axis in which different angular effects are mixed up. The angular dependent MR features in the metallic phase of (TMTSF)2ClO4 almost obey the semiclassical theory except a dip structure around B//b′. As for this non-semiclassical feature, we discuss the possibility of the one-body and many-body field-induced electron confinement onto a single conducting layer.