Coherent Quasiparticles with a Small Fermi Surface in Lightly Doped Sr3Ir2O7

De La Torre, Alberto; Hunter, E. C.; Subedi, A.; Mckeown Walker, Siobhan; Tamai, Anna; Kim, T. K.; Hoesch, M.; Perry, R. S.; Georges, Antoine; Baumberger, Félix

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Title		Coherent Quasiparticles with a Small Fermi Surface in Lightly Doped Sr₃Ir₂O₇
Authors		De La Torre, Alberto Hunter, E. C. Subedi, A. Mckeown Walker, Siobhan Tamai, Anna Kim, T. K. Hoesch, M. Perry, R. S. Georges, Antoine Baumberger, Félix show all authors [1 - 10]
Published in		Physical Review Letters. 2014, vol. 113, p. 256402
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.
Identifiers		DOI: 10.1103/PhysRevLett.113.256402
Note		5 pages, 4 figures
Full text		Article (Published version) (1.2 MB) - Free access Other version: http://link.aps.org/doi/10.1103/PhysRevLett.113.256402
Structures		Faculté des sciences / Section de physique / Département de physique de la matière quantique
Citation (ISO format)		DE LA TORRE, Alberto et al. Coherent Quasiparticles with a Small Fermi Surface in Lightly Doped Sr₃Ir₂O₇. In: Physical Review Letters, 2014, vol. 113, p. 256402. https://archive-ouverte.unige.ch/unige:44945