Tunneling spectroscopy of c-axis epitaxial cuprate junctions

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dc.citation.articleNumber224512
dc.citation.issueNumber22
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber101
dc.contributor.authorZhou, Panpan
dc.contributor.authorChen, Liyang
dc.contributor.authorSochnikov, Ilya
dc.contributor.authorWu, Tsz Chun
dc.contributor.authorFoster, Matthew S.
dc.contributor.authorBollinger, Anthony T.
dc.contributor.authorHe, Xi
dc.contributor.authorBožović, Ivan
dc.contributor.authorNatelson, Douglas
dc.date.accessioned2020-10-28T14:14:25Z
dc.date.available2020-10-28T14:14:25Z
dc.date.issued2020
dc.description.abstractAtomically precise epitaxial structures are unique systems for tunneling spectroscopy that minimize extrinsic effects of disorder. We present a systematic tunneling spectroscopy study, over a broad doping, temperature, and bias range, in epitaxial c-axis La2−xSrxCuO4/La2CuO4/La2−xSrxCuO4 heterostructures. The behavior of these superconductor/insulator/superconductor (SIS) devices is unusual. Down to 20 mK there is complete suppression of c-axis Josephson critical current with a barrier of only 2 nm of La2CuO4, and the zero-bias conductance remains at 20–30% of the normal-state conductance, implying a substantial population of in-gap states. Tunneling spectra show greatly suppressed coherence peaks. As the temperature is raised, the superconducting gap fills in rather than closing at Tc. For all doping levels, the spectra show an inelastic tunneling feature at ∼80 meV, suppressed as T exceeds Tc. These nominally simple epitaxial cuprate junctions deviate markedly from expectations based on the standard Bardeen-Cooper-Schrieffer theory.
dc.identifier.citationZhou, Panpan, Chen, Liyang, Sochnikov, Ilya, et al.. "Tunneling spectroscopy of c-axis epitaxial cuprate junctions." <i>Physical Review B,</i> 101, no. 22 (2020) American Physical Society: https://doi.org/10.1103/PhysRevB.101.224512.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.101.224512
dc.identifier.urihttps://hdl.handle.net/1911/109457
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleTunneling spectroscopy of c-axis epitaxial cuprate junctions
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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