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

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arxiv 1501.02075 v1 pith:B37BHR7Q submitted 2015-01-09 cond-mat.str-el

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 This is my paper
classification cond-mat.str-el
keywords bafe2x3csfe2se3itinerantlocalizedcore-levelphotoemissionsitestwo-leg
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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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