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

[41] Thermally activated flux motion in optimally electron-doped (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 and Ca10(Pt3As8)((Fe0.92Pt0.08)2As2)5 single crystals
Choi, W. J.
Seo, Y. I.
Ahmad, D.
Kwon, Yong Seung
RESULTS IN PHYSICS, 2020, 19
[42] ELECTRON-PARAMAGNETIC RESONANCE STUDIES ON CU(II) IONS DOPED IN TI2NI(SO4)2.6H2O SINGLE-CRYSTALS
KRISHNA, RM
RAO, JL
LAKSHMAN, SVJ
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 1992, 48 (02): : 245 - 251
[43] ELECTRON-PARAMAGNETIC-RES OF MN-2+ DOPED SINGLE-CRYSTALS OF NI(NH42) (SO4)2-6H2O AND NISO4-7H2O
MISRA, SK
MIKOLAJCZAK, B
PHYSICA STATUS SOLIDI B-BASIC RESEARCH, 1979, 96 (02): : 807 - 815
[44] ELECTRON-PARAMAGNETIC-RES OF MN-2+-DOPED SINGLE-CRYSTALS OF ZNK2(SO4)2.6H2O AND NIK2(SO4)2.6H2O - MN-2+-NI-2+ EXCHANGE CONSTANT
MISRA, SK
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PHYSICAL REVIEW B, 1983, 28 (09): : 5300 - 5303

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