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

Abstract

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 negative magnetoresistance is found in the nonlinear regime of current-voltage characteristics. The angle dependence of the magnetoresistance, studied by rotating the magnetic field upon the $c$-axis, exhibited a two-fold symmetry. The magnetoresistance amplitude exhibits maxima when the field is parallel to the $a$-axis, whereas it vanishes to the $b$-axis. The observed anisotropy may come from difference in interchain coupling of adjacent CDWs along the $a$- and $b$-axes. Comparison of the anisotropy to the scanning tunneling microscope image of CDWs allows us to provide a simple picture to explain the magnetoresistance in terms of delocalization of quantum interference of CDWs extending over the $b$-$c$ plane.

12 pages, 4 figures

References in corpus (3)

• Aharonov-Bohm Effect at liquid-nitrogen temperature: Frohlich superconducting quantum device
• Coherent quantum transport of charge density waves
• Nonlocal transport in the charge density waves of $o$-TaS${}_3$

Cited by in corpus (2)

• Negative longitudinal magnetoresistance in the density wave phase of Y${}_2$Ir${}_2$O${}_7$
• Lock-in transition of charge density waves in quasi-one-dimensional conductors: reinterpretation of McMillan's theory