Bulk nature of layered perovskite iridates beyond the Mott scenario: An approach from a bulk-sensitive photoemission study
- Yamasaki, A.
- Tachibana, S.
- Muro, T.
- Yabashi, M.
- Tamasaku, K.
- Sato, H.
- Namatame, H.
- Taniguchi, M.
- Yoshida, H.
- Okabe, H.
- Isobe, M.
- Akimitsu, J.
- Fujiwara, H.
- Drube, W.
- Claessen, R.
- Ishikawa, T.
- Imada, S.
- Sekiyama, A.
- Suga, S.
- Hloskovsky, Andrei
- Higashiya, A.
- Irizawa, A.
- Kirilmaz, O.
- Pfaff, F.
- Scheiderer, P.
- Gabel, J.
- Sing, M.
DOIAbstract
We present genuine bulk Ir 5d jeff states of layered perovskite iridates obtained by hard-x-ray photoemissionspectroscopy (HAXPES) with s- and p-polarized lights. HAXPES spectra of Sr2 IrO4 and Ba2 IrO4 are wellreproduced 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 Neel temperature as predict...
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