Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2$-x$Sr$x$CuO4

ORAL

Abstract

High-temperature superconductivity emerges from an un-conventional metallic state. This has stimulated strong efforts to understand exactly how Fermi liquids breakdown and evolve into an un-conventional metal [1,2]. A fundamental question is how Fermi liquid quasiparticle excitations break down in momentum space. Here we show, using angle-resolved photoemission spectroscopy, that the Fermi liquid quasiparticle excitations of the overdoped superconducting cuprate La1.77Sr0.23CuO4 is highly anisotropic in momentum space [3]. Fermi liquid excitations are found in the anti-nodal region whereas conventional Fermi liequid excitations are probed around the nodal point [3].\\[4pt] [1] R. A. Copper \textit{et al}., \textit{Science} \textbf{323}, 603--607 (2009).\\[0pt] [2] K. Jin \textit{et al}., \textit{Nature} \textbf{476}, 73--75 (2011).\\[0pt] [3] J. Chang \textit{et al}., \textit{Nature Communications }\textbf{4}, 2559 (2013).

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Authors

  • Johan Chang

    • Institute for Condensed Matter Physics, \'Ecole Polytechnique F\'ed\'erale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

  • Martin Maansson

    • Institute for Condensed Matter Physics, \'Ecole Polytechnique F\'ed\'erale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

  • Stephane Pailhes

    • Institut Lumi\`ere Mati\`ere, UMR5306 Universit\'e Lyon 1-CNRS, Universit\'e de Lyon, 69622 Villeurbanne, France

  • Oliver Lipscompe

    • H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK

  • Stephen Hayden

    • H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK

  • Luc Patthey

    • Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

  • Oscar Tjernberg

    • KTH Royal Institute of Technology, Materials Physics, S-164 40 Kista, Sweden

  • Joel Mesot

    • Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland