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.

引用

页数：4

共 44 条

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NEW JOURNAL OF PHYSICS, 2010, 12
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Journal of Superconductivity and Novel Magnetism, 2013, 26 : 1221 - 1225
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PHYSICAL REVIEW B, 2018, 97 (23)
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NATURE PHYSICS, 2012, 8 (05) : 376 - 381
[7] Low temperature specific heat in BaFe1.9Ni0.1As2 single crystals
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Science China Physics, Mechanics and Astronomy, 2010, 53 : 1221 - 1224
[8] Low temperature specific heat in BaFe1.9Ni0.1As2 single crystals
ZENG Bin1
2 Beijing National Laboratory for Condensed Matter Physics
Science China(Physics,Mechanics & Astronomy), 2010, (07) : 1221 - 1224
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Mengshu Liu
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Nature Physics, 2012, 8 (5) : 376 - 381
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Zeng Bin
Mu Gang
Luo HuiQian
Wen HaiHu
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY, 2010, 53 (07) : 1221 - 1224

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