| Issue |
EPL
Volume 83, Number 6, September 2008
|
|
|---|---|---|
| Article Number | 67006 | |
| Number of page(s) | 4 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/83/67006 | |
| Published online | 09 September 2008 | |
Thorium-doping
induced superconductivity up to 56 K in Gd
ThxFeAsO
Department of Physics, Zhejiang University - Hangzhou 310027, People's Republic of China
Corresponding authors: ghcao@zju.edu.cn zhuan@zju.edu.cn
Received:
26
June
2008
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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