NbS: A unique quasi one-dimensional conductor with three charge density wave transitions
arXiv:1606.09542 · doi:10.1103/PhysRevB.95.035110
Abstract
Through transport, compositional and structural studies, we review the features of the charge-density wave (CDW) conductor of NbS (phase II). We highlight three central results: 1) In addition to the previously reported CDW transitions at = 360\,K and = 150\,K, another CDW transition occurs at a much higher temperature = 620-650\,K; evidence for the non-linear conductivity of this CDW is presented. 2) We show that CDW associated with the - transition arises from S vacancies acting as donors. Such a CDW transition has not been observed before. 3) We show exceptional coherence of the -CDW at room-temperature. Additionally, we report on the effects of uniaxial strain on the CDW transition temperatures and transport.
arXiv comment16 pages, 18 figures
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