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

doi:10.1103/PhysRevLett.113.256402

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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Abstract

We characterize the electron doping evolution of (Sr_1-xLa_x)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 language	English
Article number	256402
Number of pages	5
Journal	Physical Review Letters
Volume	113
Issue number	25
DOIs	https://doi.org/10.1103/PhysRevLett.113.256402
Publication status	Published - 16 Dec 2014

Keywords

Superconductors
Phase

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10.1103/PhysRevLett.113.256402

Torre_2015_PRL_Coherent
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title = "Coherent quasiparticles with a small fermi surface in lightly doped Sr3Ir2O7",

abstract = "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.",

keywords = "Superconductors, Phase",

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

note = "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).",

year = "2014",

month = dec,

day = "16",

doi = "10.1103/PhysRevLett.113.256402",

language = "English",

volume = "113",

journal = "Physical Review Letters",

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T1 - Coherent quasiparticles with a small fermi surface in lightly doped Sr3Ir2O7

AU - De La Torre, Alberto

AU - Hunter, E. C.

AU - Subedi, A.

AU - McKeown Walker, Siobhan Ellen

AU - Tamai, Anna

AU - Kim, T. K.

AU - Hoesch, M.

AU - Perry, Robin Stuart

AU - Georges, A.

AU - Baumberger, F.

N1 - 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).

PY - 2014/12/16

Y1 - 2014/12/16

N2 - 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.

AB - 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.

KW - Superconductors

KW - Phase

UR - http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.113.256402#supplemental

U2 - 10.1103/PhysRevLett.113.256402

DO - 10.1103/PhysRevLett.113.256402

M3 - Article

SN - 0031-9007

VL - 113

JO - Physical Review Letters

JF - Physical Review Letters

IS - 25

M1 - 256402

ER -

Coherent quasiparticles with a small fermi surface in lightly doped Sr₃Ir₂O₇

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Keywords

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