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Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
Uppsala Univ, Dept Phys & Astron, SE-75121 Uppsala, Sweden..
Univ Zurich, Phys Inst, Winterthurerstr 190, CH-8057 Zurich, Switzerland..
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2018 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 7, article id 077004Article in journal (Refereed) Published
Abstract [en]

We present a soft x-ray angle-resolved photoemission spectroscopy study of overdoped high-temperature superconductors. In-plane and out-of-plane components of the Fermi surface are mapped by varying the photoemission angle and the incident photon energy. No k(z) dispersion is observed along the nodal direction, whereas a significant antinodal k(z) dispersion is identified for La-based cuprates. Based on a tight-binding parametrization, we discuss the implications for the density of states near the van Hove singularity. Our results suggest that the large electronic specific heat found in overdoped La2-xSrxCuO4 cannot be assigned to the van Hove singularity alone. We therefore propose quantum criticality induced by a collapsing pseudogap phase as a plausible explanation for observed enhancement of electronic specific heat.

Place, publisher, year, edition, pages
American Physical Society, 2018. Vol. 121, no 7, article id 077004
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-234610DOI: 10.1103/PhysRevLett.121.077004ISI: 000442083800018PubMedID: 30169083Scopus ID: 2-s2.0-85051802488OAI: oai:DiVA.org:kth-234610DiVA, id: diva2:1248174
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QC 20180914

Available from: 2018-09-14 Created: 2018-09-14 Last updated: 2018-09-14Bibliographically approved

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Nocerino, ElisabettaForslund, Ola KenjiTjernberg, OscarMånsson, Martin

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