Enhanced superconductivity of Ba0.5K0.5Fe2As2 under surface potassium dosing

被引：1
作者：
Miao, Jin [1 ,2 ,3 ]
Niu, Xiaohai [1 ,2 ,3 ]
Jiang, Juan [4 ]
Peng, Rui [1 ,2 ,3 ]
Xie, Binping [1 ,2 ]
Chen, Fei [5 ]
Xu, Haichao [1 ,2 ,3 ]
Feng, Donglai [1 ,2 ,3 ]
机构：
[1] Fudan Univ, Dept Phys, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[2] Fudan Univ, Lab Adv Mat, Shanghai 200433, Peoples R China
[3] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[4] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
[5] Shanghai Univ, Mat Genome Inst, Shanghai 200444, Peoples R China
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2018年 / 30卷 / 45期
基金：
中国国家自然科学基金;
关键词：
electronic structure; surface potassium dosing; ARPES; iron-based superconductors; PHASE-DIAGRAM;
D O I：
10.1088/1361-648X/aae423
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Surface potassium dosing has been proven to be an effective method in tuning the electron doping and enhancing the superconducting transition temperatures in both iron chalcogenides and electron doped iron pnictides. However, it is not clear how surface potassium dosing affects the hole doping and superconductivity in hole doped Fe-based superconductors. Here we performed K-dosing on Ba0.5K0.5Fe2As2, a prototypical hole-doped iron pnictide compound, and explored the electronic structure by in situ angle-resolved photoemission spectroscopy measurements. Starting from the slightly over-doped Ba0.5K0.5Fe2As2, surface K-dosing effectively reduces the hole concentration towards optimal doping and enhances the superconductivity. Intriguingly, the enhancement of superconductivity does not slow down at optimal doping, and the gap further increases with K dosing even when the carrier doping effect is saturated. Meanwhile, the quasiparticle coherence of the inner hole pockets is enhanced by higher K dosing. Our results uncover a novel scattering-reduction effect of K-dosing in Ba1-xKx Fe2As2, which collaborates with the carrier doping effect and enhances superconductivity.
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页数：5
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