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Superconductivity at about 15.6 K was achieved in Tb_{1-x}Ca_xFeAsO bypartially 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 samplewith doping level of x = 0.44. The upper critical field of this sample wasestimated to be 77 Tesla from the magnetic field dependent resistivity data.The domination of hole-like charge carriers in the low-temperature region wasconfirmed by Hall effect measurements. The comparison between the calcium-dopedsample Pr_{1-x}Ca_xFeAsO (non-superconductive) and the Strontium-doped samplePr_{1-x}Sr_xFeAsO (superconductive) suggests that a lager ion radius of thedoped alkaline-earth element compared with that of the rare-earth element maybe a necessary requirement for achieving superconductivity in the hole-doped1111 phase.

europhysics letters

Superconductivity at 15.6 K in Calcium-doped Tb_{1-x}Ca_xFeAsO: the  structure requirement for achieving superconductivity in the hole-doped 1111  phase