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Horio, M; Hauser, K; Sassa, Y; Mingazheva, Z; Sutter, D; Kramer, K; Cook, A; Nocerino, E; Forslund, O K; Tjernberg, O; Kobayashi, M; Chikina, A; Schröter, N B M; Krieger, J A; Schmitt, T; Strocov, V N; Pyon, S; Takayama, T; Takagi, H; Lipscombe, O J; Hayden, S M; Ishikado, M; Eisaki, H; Neupert, T; Månsson, M; Matt, C E; Chang, J
Physical review letters, 08/2018, Letnik: 121, Številka: 7Journal Article
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 La_{2-x}Sr_{x}CuO_{4} 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.
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