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

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

2004-08-18

arxiv.org/abs/cond-mat/0408390v2

Phys. Rev. B 70 (2004) 153105

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.70.153105

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.

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