Evolution of the remnant Fermi-surface state in the lightly doped correlated spin-orbit insulator Sr2-xLaxIrO4

Kensei Terashima, M. Sunagawa, H. Fujiwara, T. Fukura, M. Fujii, K. Okada, Kazumasa Horigane, Kaya Kobayashi, Rie Horie, Jun Akimitsu, E. Golias, D. Marchenko, A. Varykhalov, N. L. Saini, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya

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The electronic structure of the lightly electron-doped correlated spin-orbit insulator Sr2IrO4 has been studied by angle-resolved photoelectron spectroscopy. We have observed the coexistence of a lower Hubbard band and an in-gap band; the momentum dependence of the latter traces that of the band calculations without on-site Coulomb repulsion. The in-gap state remained anisotropically gapped in all observed momentum areas, forming a remnant Fermi-surface state, evolving towards the Fermi energy by carrier doping. These experimental results show a striking similarity with those observed in deeply underdoped cuprates, suggesting the common nature of the nodal liquid states observed in both compounds.

Original languageEnglish
Article number041106
JournalPhysical Review B
Issue number4
Publication statusPublished - Jul 7 2017


ASJC Scopus subject areas

  • Condensed Matter Physics

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