Quasi one dimensional charge density wave instabilities in the family of monophosphate tungsten bronzes: (PO2)4(WO3)2m

P. Foury, J. P. Pouget, Z. S. Teweldemedhin, E. Wang, M. Greenblatt

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present a X-ray diffuse scattering investigation of the members m=4,6,7 of a new series of tungsten bronzes (PO2)4(WO3)2m, which exhibit two-dimensional electronic properties. Suprisingly, at ambient temperature these materials show quasi-one-dimensional (1D) charge density wave (CDW) fluctuations, as proved by computer simulations of the X-ray patterns. These fluctuations can be associated with particular chains of WO6 octahedra, contributing to flat portions of the Fermi surface of these materials. In P4W12O44 these fluctuations condense into successive phase transitions at 120 K and 62K where the electrical resistivity shows giant anomalies. In P4W14O50 they condense at 189 K into a triply incommensurate and non-sinusoidal modulation exhibiting harmonics up to the 6th order. Below 47 K another triply incommensurate and non-sinusoidal modulation is stabilized. Different quasi-1D fluctuations are involved in the 80 K and 52 K CDW phase transitions of P4W8O32. The origin of these 1D CDW instabilities and their 3D ordering at the various phase transitions are discussed in the framework of nesting mechanisms of the Fermi surface of these bronzes.

Original languageEnglish (US)
Pages (from-to)2605-2610
Number of pages6
JournalSynthetic Metals
Volume56
Issue number2-3
DOIs
StatePublished - Apr 5 1993

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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