Electron-boson coupling and two superconducting gaps in optimally electron-doped BaFe1.9Ni0.1As2 single crystals

被引：10
|
作者：
Wang, Zhao-Sheng [1 ]
Wang, Zhen-Yu [1 ]
Luo, Hui-Qian [1 ]
Lu, Xing-Ye [1 ]
Zhu, Jun [1 ]
Li, Chun-Hong [1 ]
Shan, Lei [1 ]
Yang, Huan [1 ,2 ,3 ]
Wen, Hai-Hu [1 ,2 ,3 ]
Ren, Cong [1 ]
机构：
[1] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[2] Nanjing Univ, Ctr Superconducting Phys & Mat, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[3] Nanjing Univ, Dept Phys, Nanjing 210093, Jiangsu, Peoples R China
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 06期
基金：
美国国家科学基金会;
关键词：
TUNNELING SPECTROSCOPY; IRON PNICTIDES; NEUTRON; FAMILY;
D O I：
10.1103/PhysRevB.86.060508
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report an investigation on c-axis point-contact Andreev reflection (PCAR) spectroscopy of optimally doped BaFe1.9Ni0.1As2 single crystals. The PCAR spectrum features the structures of a conductance peak with the energy scale of an electron-boson coupling mode. Quantitative analysis using a generalized Blonder-Tinkham-Klapwijk formalism with two gaps-one isotropic and another angle dependent-resolves a nodeless state in the strong-coupling limit with gap minima on the Fermi surfaces. Using the extracted superconducting energy gap value, a characteristic boson energy Omega(b) is obtained. Our results are consistent with the pairing interaction mediated by the antiferromagnetic spin fluctuations.
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页数：4
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