Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

He, Ge; Wei, Zhongxu; Brisbois, Jérémy; Jia, Y; Huang, Y; Zhou, H; Ni, S; Silhanek, Alejandro; Shan, L; Zhu, N; Yuan, J; Dong, X; Zhou, F; Zhao, Z; Jin, K

doi:10.1088/1674-1056/27/4/047403

Article (Scientific journals)

Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

He, Ge; Wei, Zhongxu; Brisbois, Jérémy et al.

2018 • In Chinese Physics B, 27, p. 47403

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/222425

DOI
10.1088/1674-1056/27/4/047403

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Keywords :

unconventional superconductors; andreev reflexion; spectroscopy

Abstract :

[en] In this work, we discuss the origin of several anomalies present in the point-contact Andreev reflection spectra of (Li1-xFex)OHFeSe, LiTi2O4, and La2-xCexCuO4. While these features are similar to those stemming from intrinsic superconducting properties, such as Andreev reflection, electron-boson coupling, multigap superconductivity, d-wave and p-wave pairing symmetry, they cannot be accounted for by the modified Blonder–Tinkham–Klapwijk (BTK) model, but require to consider critical current effects arising from the junction geometry. Our results point to the importance of tracking the evolution of the dips and peaks in the differential conductance as a function of the bias voltage, in order to correctly deduce the properties of the superconducting state.

Disciplines :

Physics

Author, co-author :

He, Ge ^✱

Wei, Zhongxu ^✱

Brisbois, Jérémy ^✱; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés

Jia, Y

Huang, Y

Zhou, H

Ni, S

Silhanek, Alejandro ; Université de Liège - ULiège > Département de physique > Physique expérimentale des matériaux nanostructurés

Shan, L

Zhu, N

More authors (5 more)

^✱ These authors have contributed equally to this work.

Language :

English

Title :

Distinction between critical current effects and intrinsic anomalies in the point-contact Andreev reflection spectra of unconventional superconductors

Publication date :

2018

Journal title :

Chinese Physics B

ISSN :

1674-1056

eISSN :

1741-4199

Publisher :

Chinese Physical Society, China

Volume :

Pages :

47403

Peer reviewed :

Peer Reviewed verified by ORBi

Available on ORBi :

since 18 April 2018

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