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Matt, C E; Sutter, D; Cook, A M; Sassa, Y; Månsson, M; Tjernberg, O; Das, L; Horio, M; Destraz, D; Fatuzzo, C G; Hauser, K; Shi, M; Kobayashi, M; Strocov, V N; Schmitt, T; Dudin, P; Hoesch, M; Pyon, S; Takayama, T; Takagi, H; Lipscombe, O J; Hayden, S M; Kurosawa, T; Momono, N; Oda, M; Neupert, T; Chang, J
Nature communications, 03/2018, Letnik: 9, Številka: 1Journal Article
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 (Formula: see text and Formula: see text) 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.
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