Anisotropic breakdown of Fermi liquid quasiparticle excitations in overdoped La2−xSrxCuO4

J. Chang (), M. Månsson, S. Pailhès, T. Claesson, O. J. Lipscombe, S. M. Hayden, L. Patthey, O. Tjernberg and J. Mesot
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J. Chang: Institute for Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL)
M. Månsson: Institute for Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL)
S. Pailhès: Laboratory for Neutron Scattering, Paul Scherrer Institut
T. Claesson: KTH Royal Institute of Technology, Materials Physics
O. J. Lipscombe: H. H. Wills Physics Laboratory, University of Bristol
S. M. Hayden: H. H. Wills Physics Laboratory, University of Bristol
L. Patthey: Swiss Light Source, Paul Scherrer Institut
O. Tjernberg: KTH Royal Institute of Technology, Materials Physics
J. Mesot: Institute for Condensed Matter Physics, École Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2013, vol. 4, issue 1, 1-5

Abstract: 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. 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. The quasiparticle scattering and residue behave differently along the Fermi surface and hence the Kadowaki–Wood's relation is not obeyed. This kind of Fermi liquid breakdown may apply to a wide range of strongly correlated metal systems where spin fluctuations are present.

Date: 2013
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DOI: 10.1038/ncomms3559

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