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

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

2011-11-03

arxiv.org/abs/1111.0937v1

Phys. Rev B 84, 174519 (2011)

Physics

Condensed Matter

Superconductivity

9 pages, 3 figures, 2 tables. To be published in Phys Rev B

Scientific paper

10.1103/PhysRevB.84.174519

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 WO3 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.

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