NMR study of the structure and motion of charge density waves in NbSe3
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The authors report NMR measurements of the Nb93 resonance in the charge-density-wave (CDW) conductor NbSe3 on aligned, multicrystalline samples. They have observed the resonance with and without current flow in the sample at temperatures above 59 K, where a single incommensurate CDW is present. Results include (1) a demonstration that the CDW is not discommensurate, (2) quantitative measurements of CDW displacements below threshold, and (3) evidence, including current-induced motional narrowing, of CDW motion throughout the entire sample, above the threshold.