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We report the magnetoresistance of a charge-density wave (CDW) in $o$-TaS$_3$whiskers at 4.2 K under a magnetic field up to 5.2 T. An anisotropic negativemagnetoresistance is found in the nonlinear regime of current-voltagecharacteristics. The angle dependence of the magnetoresistance, studied byrotating the magnetic field upon the $c$-axis, exhibited a two-fold symmetry.The magnetoresistance amplitude exhibits maxima when the field is parallel tothe $a$-axis, whereas it vanishes to the $b$-axis. The observed anisotropy maycome from difference in interchain coupling of adjacent CDWs along the $a$- and$b$-axes. Comparison of the anisotropy to the scanning tunneling microscopeimage of CDWs allows us to provide a simple picture to explain themagnetoresistance in terms of delocalization of quantum interference of CDWsextending over the $b$-$c$ plane.

Anisotropic magnetoresistance of charge-density wave in $o$-TaS$_3$