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. This indicates a conventional, weakly correlated Fermi liquid state with a momentum independent residue Z≈0.5 in lightly doped Sr3Ir2O$_7&.
@article{arxiv.1409.7008,
title = {A weakly correlated Fermi liquid state with a small Fermi surface in lightly doped Sr$_3$Ir$_2$O$_7$},
author = {Alberto de la Torre and Emily Claire Hunter and Alaska Subedi and Siobhan McKeown Walker and Anna Tamai and Timur Kim and Moritz Hoesch and Robin Perry and Antoine Georges and Felix Baumberger},
journal= {arXiv preprint arXiv:1409.7008},
year = {2015}
}