Physics – Condensed Matter – Superconductivity
Scientific paper
2009-09-30
Europhys. Lett. 89, 27002 (2010)
Physics
Condensed Matter
Superconductivity
7 pages, 7 figures
Scientific paper
10.1209/0295-5075/89/27002
Superconductivity at about 15.6 K was achieved in Tb_{1-x}Ca_xFeAsO by partially substituting Tb^{3+} with Ca^{2+} in the nominal doping region x = 0.40 \sim 0.50. A detailed investigation was carried out in a typical sample with doping level of x = 0.44. The upper critical field of this sample was estimated to be 77 Tesla from the magnetic field dependent resistivity data. The domination of hole-like charge carriers in the low-temperature region was confirmed by Hall effect measurements. The comparison between the calcium-doped sample Pr_{1-x}Ca_xFeAsO (non-superconductive) and the Strontium-doped sample Pr_{1-x}Sr_xFeAsO (superconductive) suggests that a lager ion radius of the doped alkaline-earth element compared with that of the rare-earth element may be a necessary requirement for achieving superconductivity in the hole-doped 1111 phase.
Cheng Peng
Han Fei
Mu Gang
Shen Bing
Wen Hai-hu
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