Coexistence of localized and itinerant electrons in BaFe2X3 (X= S and Se) revealed by photoemission spectroscopy

D. Ootsuki; N. L. Saini; F. Du; Y. Hirata; K. Ohgushi; Y. Ueda; T. Mizokawa

doi:10.1103/PhysRevB.91.014505

Coexistence of localized and itinerant electrons in BaFe2X3 (X= S and Se) revealed by photoemission spectroscopy

D. Ootsuki, N. L. Saini, F. Du, Y. Hirata, K. Ohgushi, Y. Ueda, T. Mizokawa

Research output: Contribution to journal › Article › peer-review

17 Citations (Scopus)

Abstract

We report a photoemission study at room temperature on BaFe2X3 (X=S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites. The Fe 2p core-level peaks of BaFe2X3 are broad and exhibit two components, indicating that itinerant and localized Fe 3d sites coexist similar to KxFe2-ySe2. The Fe 2p core-level peak of CsFe2Se3 is rather sharp and is accompanied by a charge-transfer satellite. The insulating ground state of CsFe2Se3 can be viewed as a Fe2+ Mott insulator in spite of the formal valence of +2.5. The itinerant versus localized behaviors can be associated with the stability of chalcogen p holes in the two-leg ladder structure.

Original language	English
Article number	014505
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	91
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.91.014505
Publication status	Published - 2015 Jan 13
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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abstract = "We report a photoemission study at room temperature on BaFe2X3 (X=S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites. The Fe 2p core-level peaks of BaFe2X3 are broad and exhibit two components, indicating that itinerant and localized Fe 3d sites coexist similar to KxFe2-ySe2. The Fe 2p core-level peak of CsFe2Se3 is rather sharp and is accompanied by a charge-transfer satellite. The insulating ground state of CsFe2Se3 can be viewed as a Fe2+ Mott insulator in spite of the formal valence of +2.5. The itinerant versus localized behaviors can be associated with the stability of chalcogen p holes in the two-leg ladder structure.",

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T1 - Coexistence of localized and itinerant electrons in BaFe2X3 (X= S and Se) revealed by photoemission spectroscopy

AU - Ootsuki, D.

AU - Saini, N. L.

AU - Du, F.

AU - Hirata, Y.

AU - Ohgushi, K.

AU - Ueda, Y.

AU - Mizokawa, T.

PY - 2015/1/13

Y1 - 2015/1/13

N2 - We report a photoemission study at room temperature on BaFe2X3 (X=S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites. The Fe 2p core-level peaks of BaFe2X3 are broad and exhibit two components, indicating that itinerant and localized Fe 3d sites coexist similar to KxFe2-ySe2. The Fe 2p core-level peak of CsFe2Se3 is rather sharp and is accompanied by a charge-transfer satellite. The insulating ground state of CsFe2Se3 can be viewed as a Fe2+ Mott insulator in spite of the formal valence of +2.5. The itinerant versus localized behaviors can be associated with the stability of chalcogen p holes in the two-leg ladder structure.

AB - We report a photoemission study at room temperature on BaFe2X3 (X=S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites. The Fe 2p core-level peaks of BaFe2X3 are broad and exhibit two components, indicating that itinerant and localized Fe 3d sites coexist similar to KxFe2-ySe2. The Fe 2p core-level peak of CsFe2Se3 is rather sharp and is accompanied by a charge-transfer satellite. The insulating ground state of CsFe2Se3 can be viewed as a Fe2+ Mott insulator in spite of the formal valence of +2.5. The itinerant versus localized behaviors can be associated with the stability of chalcogen p holes in the two-leg ladder structure.

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