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 journalArticle

15 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 languageEnglish
Article number014505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number1
DOIs
Publication statusPublished - 2015 Jan 13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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