Pulsed-field study of the interference commensurate effect in quasi-one-dimensional organic conductors*

We report angle-dependent magnetoresistance oscillations for fields up to 43 T oriented mainly in the most conducting \textbf{\textit{x}}\textbf{-}\textbf{\textit{y}} plane, with small field component along the least conducting \textbf{\textit{z}} axis, in the q1d compounds (TMTSF)$_{2}$ClO$_{4}$ and (DMET)$_{2}$I$_{3}$ at 1.5 K. A hybrid plastic-metal cryoprobe system with pseudo dual-axis rotation has been built for these pulsed-field measurements. Due to the interference commensurate effect, (aka Lee-Naughton oscillations) [1-3], we have observed rich magnetoresistance oscillations, resulting from an interference effect of commensurate electron trajectories in the extended Brillouin zone. Also, we have found that, as theoretically expected [2], field-dependent magnetoresistance shows 1D and 2D transport behavior at local resistance maxima and$^{ }$minima (versus field angle), respectively. \newline [1] I.J. Lee and M.J. Naughton, Phys. Rev. B \textbf{57}, 7423 (1998).\newline [2] A.G. Lebed, \textit{et al}., Phys. Rev. Lett. \textbf{91}, 187003 (2003).\newline [3] H.I. Ha, \textit{et al}., Phys. Rev. B \textbf{73}, 033107 (2006).