Structural study of the charge-density-wave modulation of isoelectronically doped

We present a neutron and x-ray diffraction study of the charge-density-wave modulation wave vector of with isoelectronic Nb doping. In contrast to other charge-density-wave materials, like and , Nb-doped reveals a change of the modulation wave vector with doping. This change corresponds to a shift of the satellite position towards the Brillouin-zone centre on a nominal doping level of 0.8% Nb being exceeded. On a 1.2% level of Nb doping being reached, strong satellite broadening is observed, indicating the onset of short-range charge-density-wave correlation. A recently derived phenomenological model of the phase transition in , which accounts for changes in the modulation wave vector upon doping, is briefly discussed.

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