Absence of Andreev bound states in β-PdBi2 probed by point-contact Andreev reflection spectroscopy

被引：20
|
作者：
Che, Liqiang [1 ,2 ]
Le, Tian [1 ,2 ]
Xu, C. Q. [3 ,4 ]
Xing, X. Z. [5 ]
Shi, Zhixiang [5 ]
Xu, Xiaofeng [3 ,4 ]
Lu, Xin [1 ,2 ,6 ]
机构：
[1] Zhejiang Univ, Ctr Correlated Matter, Hangzhou 310058, Zhejiang, Peoples R China
[2] Zhejiang Univ, Dept Phys, Hangzhou 310058, Zhejiang, Peoples R China
[3] Hangzhou Normal Univ, Dept Phys, Hangzhou 310036, Zhejiang, Peoples R China
[4] Hangzhou Normal Univ, Hangzhou Key Lab Quantum Mattters, Hangzhou 310036, Zhejiang, Peoples R China
[5] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China
[6] Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China
来源：
PHYSICAL REVIEW B | 2016年 / 94卷 / 02期
基金：
中国国家自然科学基金;
关键词：
MAJORANA FERMIONS; SUPERCONDUCTOR; FILM; GAP;
D O I：
10.1103/PhysRevB.94.024519
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report point-contact spectroscopic studies on high quality single crystalline beta-PdBi2 with a superconducting T-c = 5.2 K. Our measurements showa typical double-peak structure in the voltage-biased junction conductance at low temperatures, probably excluding the existence of topological Andreev bound states. The conductance curves can be well fitted with the standard Blonder-Tinkham-Klapwijk model for s-wave superconductors, yielding a superconducting gap Delta(0) similar or equal to 0.92 meV with 2 Delta(0)/k(B)T(c) similar to 4.1. Our results strongly suggest that beta-PdBi2 is a conventional intermediate-coupling s-wave superconductor.
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收藏
页数：5
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