Electronic Instabilities and Localization Effects in the Quasi-Two-Dimensional Monophosphate Tungsten Bronzes (PO2)4(WO3)2m and KxP4W8O32

J. Dumas, U. Beierlein, S. Drouard, C. Hess, D. Groult, Ph Labbé, P. Roussel, G. Bonfait, E. Gomez Marin, C. Schlenker

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The monophosphate tungsten bronzes (PO2)4(WO3)2m with pentagonal tunnels are quasi-two-dimensional conductors that show charge density wave type electronic instabilities. These series of compounds provide a model system where the low-dimensional character and the average electron concentration are functions of the m parameter. The low m compounds (m=4, 6) show conventional charge density wave instabilities. The m=5 compound exists with two different crystal structures and shows instabilities with slightly different properties. We report measurements of transport properties for the compounds m=5, 7, 8, 9. We show that, for m>7, these compounds exhibit an upturn of resistivity and field dependence of the magnetoresistance characteristic of quantum interference effects. We also report transport properties of the compounds KxP4W8O32 with pseudo-hexagonal tunnels that show electronic instabilities with critical temperatures depending on x.

Original languageEnglish
Pages (from-to)320-327
Number of pages8
JournalJournal of Solid State Chemistry
Volume147
Issue number1
DOIs
Publication statusPublished - 1 Oct 1999

Keywords

  • Charge density wave; magnetotransport; localization; low dimensional.

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