Volume 83, Number 6, September 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||09 September 2008|
Thorium-dopinginduced superconductivity up to 56 K in GdThxFeAsO
Department of Physics, Zhejiang University - Hangzhou 310027, People's Republic of China
Accepted: 30 July 2008
We report a new strategy to induce superconductivity in iron-based oxyarsenide. Instead of F- substitution for O2-, we employed Th4+ doping in GdFeAsO with the consideration of “lattice match" between Gd2O2 layers and Fe2As2 ones. As a result, superconductivity with as high as 56 K was realized in a Gd0.8Th0.2FeAsO polycrystalline sample. This Tc value is among the highest ever discovered in the iron-based oxypnictides.
PACS: 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.) / 74.62.Dh – Effects of crystal defects, doping and substitution / 74.62.Bf – Effects of material synthesis, crystal structure, and chemical composition
© EPLA, 2008
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