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Direct observation of orbital hybridisation in a cuprate superconductor
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- Matt, C. E. (author)
- Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.;Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.
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- Sutter, D. (author)
- Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.
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- Cook, A. M. (author)
- Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland.,KTH Royal Inst Technol, Mat Phys, SE-16440 Stockholm, Sweden.
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- Horio, M. (author)
- Shi, M. (author)
- Kobayashi, M. (author)
- Hoesch, M. (author)
- Hayden, S. M. (author)
- Kurosawa, T. (author)
- Oda, M. (author)
- Neupert, T. (author)
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- Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland;Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland. Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland. (creator_code:org_t)
- 2018-03-06
- 2018
- English.
- In: Nature Communications. - : Nature Publishing Group. - 2041-1723. ; 9
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
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- Matt, C. E.
- Sutter, D.
- Cook, A. M.
- Sassa, Yasmine
- Månsson, Martin, ...
- Tjernberg, Oscar
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- 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.
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