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.

引用

页数：5

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