Pulsed Field Studies of Unconventional Magnetoresistance in Q1D Conductors

We built a single-axis sample rotator for use in a 45T pulsed magnetic field system. We used this to measure the magnetoresistance of the quasi-one dimensional organic conductor (TMTSF)$_2$ClO$_4$ in the interference-commensurate ``L-N" angle regime. We were able to obtain the angle-dependent magnetoresistance and observe the L-N oscillations. We were further able to study the field-dependence of the magnetoresistance at very high field, thus extending the work of Ha, {\it et al.}, to several times higher field. In our talk, we compare the recent theory of Lebed, which suggests unconventional $B$-dependence at various resistance maxima and minima (vs. angle), associated with unusual dimensional crossovers, to our pulsed field data.