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

被引：46
作者：
Hirai, D. [1 ]
Climent-Pascual, E. [1 ]
Cava, R. J. [1 ]
机构：
[1] Princeton Univ, Dept Chem, Princeton, NJ 08544 USA
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 17期
关键词：
COPPER OXYFLUORIDES; CRITICAL FIELD; METAL-OXIDES; TUNGSTEN; TEMPERATURE; DIFFRACTION; NAXWO3;
D O I：
10.1103/PhysRevB.84.174519
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 (T-c = 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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页数：6
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