Single particle tunneling spectrum of superconducting Nd1-xSrxNiO2 thin films

被引：157

作者：

Gu, Qiangqiang ^{[1
,2
]}

Li, Yueying ^{[3
]}

Wan, Siyuan ^{[1
,2
]}

Li, Huazhou ^{[1
,2
]}

Guo, Wei ^{[3
]}

Yang, Huan ^{[1
,2
]}

Li, Qing ^{[1
,2
]}

Zhu, Xiyu ^{[1
,2
]}

Pan, Xiaoqing ^{[4
]}

Nie, Yuefeng ^{[3
]}

Wen, Hai-Hu ^{[1
,2
]}

机构：

[1] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Ctr Superconducting Phys & Mat, Natl Lab Solid State Microstruct, Nanjing, Peoples R China

[2] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Ctr Superconducting Phys & Mat, Dept Phys, Nanjing, Peoples R China

[3] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Jiangsu Key Lab Artificial Funct Mat, Coll Engn & Appl Sci,Natl Lab Solid State Microst, Nanjing, Peoples R China

[4] Univ Calif Irvine, Dept Phys & Astron, Dept Mat Sci & Engn, Irvine, CA 92697 USA

来源：

NATURE COMMUNICATIONS | 2020年 / 11卷 / 01期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

D O I：

10.1038/s41467-020-19908-1

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The pairing mechanism in cuprates remains as one of the most challenging issues in condensed matter physics. Recently, superconductivity was discovered in thin films of the infinite-layer nickelate Nd1-xSrxNiO2 (x=0.12-0.25) which is believed to have the similar 3d(9) orbital electrons as that in cuprates. Here we report single-particle tunneling measurements on the superconducting nickelate thin films. We find predominantly two types of tunneling spectra, one shows a V-shape feature which can be fitted well by a d-wave gap function with gap maximum of about 3.9meV, another one exhibits a full gap of about 2.35meV. Some spectra demonstrate mixed contributions of these two components. Combining with theoretical calculations, we attribute the d-wave gap to the pairing potential of the Ni-3dx2-y2 orbital. Several possible reasons are given for explaining the full gap feature. Our results indicate both similarities and distinctions between the newly found Ni-based superconductors and cuprates.

引用

页数：7

共 29 条

[1] Orbital-selective superconductivity in a two-band model of infinite-layer nickelates [J].