Single particle tunneling spectrum of superconducting Nd1-xSrxNiO2 thin films

Qiangqiang Gu, Yueying Li, Siyuan Wan, Huazhou Li, Wei Guo, Huan Yang, Qing Li, Xiyu Zhu, Xiaoqing Pan, Yuefeng Nie () and Hai-Hu Wen ()
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Qiangqiang Gu: Nanjing University
Yueying Li: Nanjing University
Siyuan Wan: Nanjing University
Huazhou Li: Nanjing University
Wei Guo: Nanjing University
Huan Yang: Nanjing University
Qing Li: Nanjing University
Xiyu Zhu: Nanjing University
Xiaoqing Pan: University of California
Yuefeng Nie: Nanjing University
Hai-Hu Wen: Nanjing University

Nature Communications, 2020, vol. 11, issue 1, 1-7

Abstract: Abstract 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 3d9 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 3.9 meV, another one exhibits a full gap of about 2.35 meV. 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 $${\mathrm{Ni - }}3d_{x^2 - y^2}$$ Ni- 3 d x 2 − y 2 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.

Date: 2020
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DOI: 10.1038/s41467-020-19908-1

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