Superconductivity Induced by Co-Doping in Quaternary Fluoroarsenide CaFeAsF
- 9 October 2008
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 130 (44), 14428-14429
- https://doi.org/10.1021/ja806357j
Abstract
A new quaternary fluoroarsenide CaFeAsF with the tetragonal ZrCuSiAs-type structure composed of alternate stacking of (FeAs)δ− and (CaF)δ+ layers was synthesized. CaFeAsF is a poor metal and shows the anomaly at ∼120 K in temperature dependence of electrical conductivity. The electron doping by the partial replacement of the iron with cobalt suppresses the anomaly and induces the bulk superconductivity (optimal Tc = 22 K for CaFe0.9Co0.1AsF), analogous to recently discovered FeAs-based superconductors. The present results suggest that CaFeAsF is a promising candidate as a parent compound for high Tc superconductors.This publication has 17 references indexed in Scilit:
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