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Direct observation of orbital hybridisation in a cuprate superconductor
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2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 972Article in journal (Refereed) Published
Abstract [en]

The minimal ingredients to explain the essential physics of layered copper-oxide (cuprates) materials remains heavily debated. Effective low-energy single-band models of the copper-oxygen orbitals are widely used because there exists no strong experimental evidence supporting multi-band structures. Here, we report angle-resolved photoelectron spectroscopy experiments on La-based cuprates that provide direct observation of a two-band structure. This electronic structure, qualitatively consistent with density functional theory, is parametrised by a two-orbital (d(x2-y2) and d(z2)) tight-binding model. We quantify the orbital hybridisation which provides an explanation for the Fermi surface topology and the proximity of the van-Hove singularity to the Fermi level. Our analysis leads to a unification of electronic hopping parameters for single-layer cuprates and we conclude that hybridisation, restraining d-wave pairing, is an important optimisation element for superconductivity.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018. Vol. 9, article id 972
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URN: urn:nbn:se:kth:diva-224679DOI: 10.1038/s41467-018-03266-0ISI: 000426660300004PubMedID: 29511188Scopus ID: 2-s2.0-85043230277OAI: oai:DiVA.org:kth-224679DiVA, id: diva2:1193051
Funder
Swedish Research Council, dnr.2016-06955Knut and Alice Wallenberg Foundation
Note

QC 20180326

Available from: 2018-03-26 Created: 2018-03-26 Last updated: 2018-03-26Bibliographically approved

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Månsson, Martin

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