Chin. Phys. Lett.  2008, Vol. 25 Issue (9): 3403-3405    DOI:
Original Articles |
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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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.
Keywords: 74.70.-b      74.62.Bf     
Received: 13 June 2008      Published: 29 August 2008
PACS:  74.70.-b (Superconducting materials other than cuprates)  
  74.62.Bf (Effects of material synthesis, crystal structure, and chemical composition)  
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CHEN Gen-Fu, LI Zheng, LI Gang et al  2008 Chin. Phys. Lett. 25 3403-3405
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http://cpl.iphy.ac.cn/       OR      http://cpl.iphy.ac.cn/Y2008/V25/I9/03403
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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
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