Tunneling spectroscopy of c-axis epitaxial cuprate junctions

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dc.citation.articleNumber224512en_US
dc.citation.issueNumber22en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber101en_US
dc.contributor.authorZhou, Panpanen_US
dc.contributor.authorChen, Liyangen_US
dc.contributor.authorSochnikov, Ilyaen_US
dc.contributor.authorWu, Tsz Chunen_US
dc.contributor.authorFoster, Matthew S.en_US
dc.contributor.authorBollinger, Anthony T.en_US
dc.contributor.authorHe, Xien_US
dc.contributor.authorBožović, Ivanen_US
dc.contributor.authorNatelson, Douglasen_US
dc.date.accessioned2020-10-28T14:14:25Zen_US
dc.date.available2020-10-28T14:14:25Zen_US
dc.date.issued2020en_US
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.en_US
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.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.101.224512en_US
dc.identifier.urihttps://hdl.handle.net/1911/109457en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
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.en_US
dc.titleTunneling spectroscopy of c-axis epitaxial cuprate junctionsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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