Two superconducting components with different symmetries in Nd1-xSrxNiO2 films

Abstract

The pairing mechanism in cuprates remains as one of the most challenging issues in the field of condensed matter physics. The unique 3d9 electron orbital of the Cu2+ ionic states in cuprates is supposed to be the major player for the occurrence of superconductivity. Recently, superconductivity at about 9-15 K was discovered in infinite layer thin films of nickelate Nd1-xSrxNiO2 (x=0.1-0.2) which is believed to have the similar 3d9 orbital electrons. The key issue concerned here is about the superconducting gap function. Here we report the first set data of 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 very 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. Our results suggest that the newly found Ni-based superconductors play as close analogs to cuprates, and thus demonstrate the commonality of unconventional superconductivity.

arXiv comment24 pages, 4 figures in Main Text and 7 figures in Supplementary Information

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• Observation of perfect diamagnetism and interfacial effect on the electronic structures in Nd0.8Sr0.2NiO2 superconducting infinite layers
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• Dynamical Mean Field Studies of Infinite Layer Nickelates: Physics Results and Methodological Implications
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• Infinite-layer nickelate superconductors: A current experimental perspective of the crystal and electronic structures
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• Stability of Superconducting Nd0.8Sr0.2NiO2 Thin Films
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• An electronic origin of charge order in infinite-layer nickelates
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• Microscopic Theory of Superconducting Phase Diagram in Infinite-Layer Nickelates
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