摘要A series of Th and F co-doped superconductors Sm1-xThxFeAsO1-yFy are synthesized and the variation of superconductivity with the doping level is investigated. At the fixed Th doping level x = 0.1, the superconducting transition temperature Tc increases monotonically with F content, and finally Tc reaches a maximum of about 55K around y = 0.1, and saturates for even more F content (y = 0.15). Similar to the SmFeAsO1-yFy system, the normal state thermopower increases monotonically with the doping level. However the decrease of Tc in the `overdoped' regime is not observed and possible explanation is discussed.
Abstract：A series of Th and F co-doped superconductors Sm1-xThxFeAsO1-yFy are synthesized and the variation of superconductivity with the doping level is investigated. At the fixed Th doping level x = 0.1, the superconducting transition temperature Tc increases monotonically with F content, and finally Tc reaches a maximum of about 55K around y = 0.1, and saturates for even more F content (y = 0.15). Similar to the SmFeAsO1-yFy system, the normal state thermopower increases monotonically with the doping level. However the decrease of Tc in the `overdoped' regime is not observed and possible explanation is discussed.
LI Yu-ke;LIN Xiao;TAO Qian;CHEN Hang;WANG Cao;LI Lin-Jun;LUO Yong-Kang;HE Mi;ZHU Zeng-Wei;CAO Gang-Han;XU Zhu-An. Superconductivity and Transport Properties in Th and F Codoped Sm1-xThxFeAsO1-yFy[J]. 中国物理快报, 2009, 26(1): 17402-017402.
LI Yu-ke, LIN Xiao, TAO Qian, CHEN Hang, WANG Cao, LI Lin-Jun, LUO Yong-Kang, HE Mi, ZHU Zeng-Wei, CAO Gang-Han, XU Zhu-An. Superconductivity and Transport Properties in Th and F Codoped Sm1-xThxFeAsO1-yFy. Chin. Phys. Lett., 2009, 26(1): 17402-017402.
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