Superconductivity in WO2.6F0.4 synthesized by reaction of WO3 with teflon

D. Hirai, E. Climent-Pascual, R. J. Cava

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WO3-xFx (x ≤ 0.45) perovskite-like oxyfluorides were prepared by a chemically reducing fluorination route using the polymer polytetrafluoroethylene (teflon). The symmetry of the crystal structures of WO3-xFx changes from monoclinic to tetragonal to cubic as the fluorine content increases. Fluorine doping changes insulating WO 3 to a metallic conductor, and superconductivity (Tc = 0.4 K) was discovered in the samples with fluorine contents of 0.41 ≤ x ≤ 0.45. This easy fluorination method may be applicable to other systems and presents an opportunity for finding new oxyfluoride superconductors.

Original languageEnglish (US)
Article number174519
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
StatePublished - Nov 22 2011

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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