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Structural investigation of a new variety of the low dimensional conductor \(\) with 2m = 5 + 5: P 4 W 10 O 38

  • P. Roussel
  • P. Foury-Leylekian
  • B. Domengès
  • D. Groult
  • P. Labbé
  • J.-P. Pouget

Abstract:

A new variety of P 4 W 10 O 38 , m = 5 member of the monophosphate tungsten-bronze family with pentagonal tunnels (MPTBp), \(\), has been isolated and studied by X-ray diffraction measurements. The structure has been solved by direct methods from single crystal X-ray data. The monoclinic unit cell corresponds to a regular stacking of WO 3 -type slabs which are all five-WO 6 -octahedra thick and connected through PO 4 tetrahedra. This structure is comparable to that previously described for the MPTBp'series with m = 4 (P 4 W 8 O 32 ) and m = 6 (P 4 W 12 O 44 ). An X-ray diffuse scattering investigation has revealed that this member is subjected to charge density wave instabilities (CDW) located on chains running along the \(\) directions. Two CDW transitions have been observed at \(\) and \(\), bearing some resemblance with those exhibited by the m = 4 member. The corresponding modulation wave vectors can be accounted for by a hidden nesting mechanism which connects the crossing points of differently oriented quasi-planar Fermi surfaces, as found for the low m (4 and 6) members of the MPTB's.

PACS. 61.10.-i X-ray diffraction and scattering – 61.14.-x Electron diffraction and scattering – 71.45.Lr Charge-density-wave systems 

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Copyright information

© EDP Sciences, Springer-Verlag, Società Italiana di Fisica 1999

Authors and Affiliations

  • P. Roussel
    • 1
  • P. Foury-Leylekian
    • 2
  • B. Domengès
    • 1
  • D. Groult
    • 1
  • P. Labbé
    • 1
  • J.-P. Pouget
    • 2
  1. 1.Laboratoire CRISMAT (CNRS UMR 6508), ISMRA-Université de Caen, 14050 Caen Cedex, FranceFR
  2. 2.Laboratoire de Physique des Solides (CNRS UMR 8502), Université de Paris-Sud, 91405 Orsay Cedex, FranceFR

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