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Superconductivity in Hole-Doped (Sr1-xKx)Fe2As2 |
| CHEN Gen-Fu, LI Zheng, LI Gang, HU Wan-Zheng, DONG Jing, ZHOU Jun, ZHANG Xiao-Dong, ZHENG Ping, WANG Nan-Lin, LUO Jian-Lin |
| Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190 |
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| Cite this article: |
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CHEN Gen-Fu, LI Zheng, LI Gang et al 2008 Chin. Phys. Lett. 25 3403-3405 |
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Abstract A series of layered (Sr1-xKx)Fe2As2 compounds with nominal x=0--0.40 are synthesized by solid state reaction method. Similar to other parent compounds of iron-based pnictide superconductors, pure SrFe2As2 shows a strong resistivity anomaly near 210 K, which was ascribed to the spin-density-wave instability. The anomaly temperature is much higher than those observed in LaOFeAs and BaFe2As2, the two prototype parent compounds with ZrCuSiAs- and ThCr2Si2-type structures. K-doping strongly suppresses this anomaly and induces superconductivity. Like in the case of K-doped BaFe2As2, sharp superconducting transitions at Tc38K is observed. We perform the Hall coefficient measurement, and confirm that the dominant carriers are hole-type. The carrier density is enhanced by a factor of 3 in comparison to F-doped LaOFeAs superconductor.
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| Keywords:
74.70.-b
74.62.Bf
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Received: 13 June 2008
Published: 29 August 2008
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| PACS: |
74.70.-b
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(Superconducting materials other than cuprates)
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74.62.Bf
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(Effects of material synthesis, crystal structure, and chemical composition)
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