NMR study of the phasing of charge density waves in 2HNbSe 2

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The 93Nb NMR spectra are analyzed to obtain phase parameters of the charge-density-wave (CDW) state in 2HNbSe 2. It is shown that the experimental data rule out the hexagonal symmetry of the CDW state. The shapes of both the Knight shift and the electric-field-gradient distributions are consistent with the locally commensurate orthorhombic CDW state within each SeNbSe layer. The phase parameters of this state are found to be close to those obtained for the commensurate 2HTaSe 2 by Pfeiffer et al.