Coherent quasiparticles with a small fermi surface in lightly doped Sr3Ir2O7
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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.
De La Torre , A , Hunter , E C , Subedi , A , McKeown Walker , S E , Tamai , A , Kim , T K , Hoesch , M , Perry , R S , Georges , A & Baumberger , F 2014 , ' Coherent quasiparticles with a small fermi surface in lightly doped Sr 3 Ir 2 O 7 ' Physical Review Letters , vol 113 , no. 25 , 256402 . DOI: 10.1103/PhysRevLett.113.256402
Physical Review Letters
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his work was funded by the Swiss National Science Foundation (Grant No. 200021-146995), the UK Royal Society, the UK-EPSRC, and the European Research Council (Grant No. ERC-319286 QMAC).
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