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 | |
| 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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Ootsuki, D., Saini, N. L., Du, F., Hirata, Y., Ohgushi, K., Ueda, Y., & Mizokawa, T. (2015). Coexistence of localized and itinerant electrons in BaFe2X3 (X= S and Se) revealed by photoemission spectroscopy. Physical Review B - Condensed Matter and Materials Physics, 91(1), [014505]. https://doi.org/10.1103/PhysRevB.91.014505