Coherent quasiparticles with a small fermi surface in lightly doped Sr3Ir2O7

Alberto De La Torre, E. C. Hunter, A. Subedi, Siobhan Ellen McKeown Walker, Anna Tamai, T. K. Kim, M. Hoesch, Robin Stuart Perry, A. Georges, F. Baumberger

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We characterize the electron doping evolution of (Sr1-xLax)3Ir2O7 by means of angle-resolved photoemission. Concomitant with the metal insulator transition around x ≈ 0.05 we find the emergence of coherent quasiparticle states forming a closed small Fermi surface of volume 3x/2, where x is the independently measured La concentration. The quasiparticle weight Z remains large along the entire Fermi surface, consistent with the moderate renormalization of the low-energy dispersion, and no pseudogap is observed. This indicates a conventional, weakly correlated Fermi liquid state with a momentum independent residue Z ≈ 0.5 in lightly doped Sr3Ir2O7.

Original languageEnglish
Article number256402
Number of pages5
JournalPhysical Review Letters
Issue number25
Publication statusPublished - 16 Dec 2014


  • Superconductors
  • Phase


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