Superconductivity in Hole-Doped (Sr1−xKx)Fe2As2
Superconductivity in Hole-Doped (Sr1−xKx)Fe2As2
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DOI：
10.1088/0256-307x/25/9/083
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发表时间：
2008
影响因子：
3.5
通讯作者：
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
中科院分区：
文献类型：
--
作者：
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
用固相反应法合成了系列层状（Sr_（1-x）Kx）Fe_2As_2化合物，其标称x = 0-0.40。与其他铁基磷属元素化物超导体的母体化合物类似，纯SrFe_2As_2在210 K附近显示出强烈的电阻率异常，这归因于自旋密度波不稳定性。异常温度远高于LaOFeAs和BaFe 2As 2中观察到的温度，这两个原型母体化合物具有ZrCuSiAs和ThCr 2Si 2型结构。K掺杂强烈抑制了这种异常并诱导了超导电性。与掺K的BaFe_2As_2的情况一样，观察到Tc = 38 K的急剧超导转变。我们进行了霍尔系数的测量，并证实了占主导地位的载流子是空穴型。的载流子密度提高了3倍的F掺杂的LaOFeAs超导体相比。
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.