| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconductivity and Transport Properties in Th and F Codoped Sm1-xThxFeAsO1-yFy |
| 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 |
| Department of Physics, Zhejiang University, Hangzhou 310027 |
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| Cite this article: |
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LI Yu-ke, LIN Xiao, TAO Qian et al 2009 Chin. Phys. Lett. 26 017402 |
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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.
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| Keywords:
74.70.Dd
74.62.Dh
74.25.Fy
74.25.Dw
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Received: 28 October 2008
Published: 24 December 2008
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| PACS: |
74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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74.62.Dh
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(Effects of crystal defects, doping and substitution)
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74.25.Fy
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74.25.Dw
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(Superconductivity phase diagrams)
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