Synthesis, characterization, and finite size effects on electrical transport of nanoribbons of the charge density wave conductor NbSe_3

摘要

NbSe_3 exhibits remarkable anisotropy in most of its physical properties and has been a model system for studies of quasi-one-dimensional charge density wave (CDW) phenomena. Herein, we report the synthesis, characterization, and electrical transport of single-crystalline NbSe_3 nanoribbons by a facile one-step vapour transport process involving the transport of selenium powder onto a niobium foil substrate. Our investigations aid the understanding of the CDW nature of NbSe_3 and the growth process of the material. They also indicate that NbSe_3 nanoribbons have enhanced CDW properties compared to those of the bulk phase due to size confinement effects, thus expanding the search for new mesoscopic phenomena at the nanoscale level. Single nanoribbon measurements of the electrical resistance as a function of temperature show charge density wave transitions at 59 and 141K. We also demonstrate significant enhancement in the depinning effect and sliding regimes mainly attributed to finite size effects.