Structural Characterization of the Sliding Charge-Density-Wave Conductor, Rb0.30MoO3, by Nuclear Magnetic Resonance

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Nuclear magnetic resonance is used to determine the electric field gradients and magnetic chemical shifts at the Rb87 sites in single crystals of Rb0.30MoO3 at several temperatures in the high-temperature phase and in the charge-density-wave (CDW) state, below 180 K. The chemical-shift anisotropy is small; spectral shift and shape are dominated by electric field gradients. An analysis of spectral shape, as a function of crystal orientation, that draws upon analogy with image reconstruction from projections, gives a picture of spatial orientation and probability distribution of field gradients caused by the CDW that agree with x-ray results except for a suggestion that a small component of CDW may be present along the crystal a axis. A simple electrostatic model of the CDW implies that a charge equivalent to 2 electrons per unit cell is responsible for the observed spectral broadening.



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