Charge-Density-Wave Ordering in the Metal-Insulator Transition Compound PrRu4P12

Abstract

X-ray and electron diffraction measurements on the metal-insulator (M-I) transition compound PrRu${}_4$P${}_{12}$ have revealed the emergence of a periodic ordering of charge density around the 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$\bar{3}$ to Pm$\bar{3}$ below the M-I transition temperature and also that the temperature dependence of the superlattice peaks in the insulator phase follows the squared BCS function. The M-I transition could be originated from the perfect nesting of the Fermi surface and/or the instability of the $f$ electrons.

4 pages, 5 figures, Phys. Rev. B (2004) (in press)

References in corpus (1)

• Structural Phase Transition Accompanied by Metal - Insulator Transition in PrRu4P12

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