Charge-density-wave ordering in the metal-insulator transition compoundPrRu4P12

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Abstract

X-ray and electron diffraction measurements on the metal-insulator $(M\text{\ensuremath{-}}I)$ transition compound ${\mathrm{PrRu}}_{4}{\mathrm{P}}_{12}$ have revealed a periodic ordering of charge density around the $\mathrm{Pr}$ atoms. It is found that the ordering is associated with the onset of a low temperature insulator phase. These conclusions are supported by the facts that the space group of the crystal structure transforms from $Im\overline{3}$ to $Pm\overline{3}$ below the $M\text{\ensuremath{-}}I$ transition temperature and also that the temperature dependence of the superlattice peaks in the insulator phase follows the squared BCS function. The $M\text{\ensuremath{-}}I$ transition could be originated from the perfect nesting of the Fermi surface and/or the instability of the $f$ electrons.

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