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

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.

arXiv comment5 pages, 5 figures, Accepted in publication for Physical Review B

References in corpus (12)

• Nanoscale phase separation in the iron chalcogenide superconductor K0.8Fe1.6Se2 as seen via scanning nanofocused x-ray diffraction
• Common Crystalline and Magnetic Structure of superconducting A2Fe4Se5
• Coexistence of Magnetism and Superconductivity in the Iron-based Compound Cs_0.8(FeSe_0.98)_2
• Iron Displacements and Magnetoelastic Coupling in the Spin-Ladder Compound BaFe2Se3
• Orbital Selective Magnetism in the Spin-Ladder Iron Selenides Ba${}_{1-x}$K${}_x$Fe${}_2$Se${}_3$
• Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe2Se3
• Anisotropy in BaFe2Se3 single crystals with double chains of FeSe tetrahedra
• BaFe${}_2$Se${}_3$: a high $T_{\mathrm{C}}$ magnetic multiferroic with large ferrielectric polarization
• Magnetic States of the Two-Leg Ladder Alkali Metal Iron Selenides $A$Fe${}_2$Se${}_3$
• Synthesis, crystal and magnetic structure of iron selenide BaFe2Se3 with possible superconductivity at Tc=11K
• Spectromicroscopy of electronic phase separation in K${}_x$Fe${}_{2-y}$Se${}_2$ superconductor
• Electronic and Magnetic Structure of Possible Iron Based Superconductor BaFe2Se3

Cited by in corpus (15)

• The magnetic precursor of the pressure-induced superconductivity in Fe-ladder compound
• Fingerprints of an Exotic Orbital-Selective Mott Phase in the Block Magnetic State of BaFe${}_2$Se${}_3$ Ladders
• Orbital order and fluctuations in the two-leg ladder materials BaFe${}_2{X}_3$ ($X$ = S and Se) and CsFe${}_2$Se${}_3$
• Gradual Enhancement of Stripe-Type Antiferromagnetism in Spin Ladder Material BaFe${}_2$S${}_3$ Under Pressure
• Interaction-induced topological phase transition and Majorana edge states in low-dimensional orbital-selective Mott insulators
• Magnetic states of iron-based two-leg ladder tellurides
• Strong ferromagnetic exchange interaction in the parent state of the superconductivity in BaFe${}_2$S${}_3$
• Strong electronic correlations and Fermi surface reconstruction in the quasi-one dimensional iron superconductor BaFe2S3
• Microscopic description of insulator-metal transition in high-pressure oxygen
• Pressure-Induced Metallization in Iron-Based Ladder Compounds Ba${}_{1-x}$Cs${}_x$Fe${}_2$Se${}_3$
• Magnetic-order-driven metal-insulator transitions in the quasi-one-dimensional spin-ladder compounds BaFe${}_2$S${}_3$ and BaFe${}_2$Se${}_3$
• Dichotomy Between Orbital and Magnetic Nematic Instabilities in BaFe2S3
• Discovery of room temperature multiferroicity and magneto-electric coupling in Fe3Se4 nanorods
• Intertwined charge, spin, and orbital degrees of freedom under electronic correlations in the one-dimensional Fe${}^{3+}$ chalcogenide chain
• PhD Thesis: Electronic correlations in multiorbital systems