Superconductivity in hole-doped (Sr(1-x)K(x))Fe(2)As(2)

By Gen-Fu Chen, Li Zheng, Li Gang, Wan-zheng Hu, Dong Jing, Zhou Jun, Xiaodong Zhang, Zheng Ping, Nanlin Wang, Jian-Lin Luo. 2008

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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 Tc ~ 38 K 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.

Subfields: Accounting, Electronic, Optical and Magnetic Materials, Strategy and Management

View Paper: https://www.semanticscholar.org/paper/0f3a46f63923b8a992a71a191e294ad9ae9a8257