Bulk nature of layered perovskite iridates beyond the Mott scenario: An approach from a bulk-sensitive photoemission study

A. Yamasaki, S. Tachibana, H. Fujiwara, A. Higashiya, A. Irizawa, O. Kirilmaz, F. Pfaff, P. Scheiderer, J. Gabel, M. Sing, T. Muro, M. Yabashi, K. Tamasaku, H. Sato, H. Namatame, M. Taniguchi, A. Hloskovskyy, H. Yoshida, H. Okabe, M. IsobeJ. Akimitsu, W. Drube, R. Claessen, T. Ishikawa, S. Imada, A. Sekiyama, S. Suga

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17 Citations (Scopus)

Abstract

We present genuine bulk Ir 5d jeff states of layered perovskite iridates obtained by hard-x-ray photoemission spectroscopy (HAXPES) with s- and p-polarized lights. HAXPES spectra of Sr2IrO4 and Ba2IrO4 are well reproduced by the quasiparticle density of states calculated by the local density approximation with dynamical mean-field theory (LDA+DMFT). It is demonstrated that the insulating nature of the iridates is triggered by antiferromagnetic correlation (Slater type) combined with electron correlation (Mott type). The extremely-low-energy bulk-sensitive photoemission spectroscopy reveals "bad metallic" states in the paramagnetic phase of the iridates, suggesting strongly renormalized metallic states above the Néel temperature as predicted by the LDA+DMFT.

Original languageEnglish
Article number121111
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number12
DOIs
Publication statusPublished - Mar 24 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Yamasaki, A., Tachibana, S., Fujiwara, H., Higashiya, A., Irizawa, A., Kirilmaz, O., Pfaff, F., Scheiderer, P., Gabel, J., Sing, M., Muro, T., Yabashi, M., Tamasaku, K., Sato, H., Namatame, H., Taniguchi, M., Hloskovskyy, A., Yoshida, H., Okabe, H., ... Suga, S. (2014). Bulk nature of layered perovskite iridates beyond the Mott scenario: An approach from a bulk-sensitive photoemission study. Physical Review B - Condensed Matter and Materials Physics, 89(12), [121111]. https://doi.org/10.1103/PhysRevB.89.121111