X-ray spectroscopic study of BaFeO3 thin films

An Fe4+ ferromagnetic insulator

T. Tsuyama, T. Matsuda, S. Chakraverty, J. Okamoto, E. Ikenaga, A. Tanaka, Takashi Mizokawa, H. Y. Hwang, Y. Tokura, H. Wadati

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We investigated the electronic and magnetic properties of fully oxidized BaFeO3 thin films, which show ferromagnetic-insulating properties with cubic crystal structure, by hard x-ray photoemission spectroscopy (HAXPES), x-ray absorption spectroscopy (XAS), and soft x-ray magnetic circular dichroism (XMCD). We analyzed the results with configuration-interaction (CI) cluster-model calculations for Fe4+, which showed good agreement with the experimental results. We also studied SrFeO3 thin films, which have an Fe4+ ion helical magnetism in cubic crystal structure, but are metallic at all temperatures. We found that BaFeO3 thin films are insulating with large magnetization (1.7μB/formula unit) under ∼1 T, using valence-band HAXPES and Fe 2p XMCD, which is consistent with the previously reported resistivity and magnetization measurements. Although Fe 2p core-level HAXPES and Fe 2p XAS spectra of BaFeO3 and SrFeO3 thin films are quite similar, we compared the insulating BaFeO3 to metallic SrFeO3 thin films with valence-band HAXPES. The CI cluster-model analysis indicates that the ground state of BaFeO3 is dominated by d5L(L: ligand hole) configuration due to the negative charge transfer energy, and that the band gap has significant O 2p character. We revealed that the differences of the electronic and magnetic properties between BaFeO3 and SrFeO3 arise from the differences in their lattice constants, through affecting the strength of hybridization and bandwidth.

Original languageEnglish
Article number115101
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number11
DOIs
Publication statusPublished - 2015 Mar 2
Externally publishedYes

Fingerprint

insulators
X rays
Thin films
photoelectric emission
Photoelectron spectroscopy
thin films
x rays
x ray absorption
x ray spectroscopy
spectroscopy
configuration interaction
dichroism
absorption spectroscopy
Dichroism
Valence bands
Absorption spectroscopy
Electronic properties
magnetic properties
valence
Magnetization

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Tsuyama, T., Matsuda, T., Chakraverty, S., Okamoto, J., Ikenaga, E., Tanaka, A., ... Wadati, H. (2015). X-ray spectroscopic study of BaFeO3 thin films: An Fe4+ ferromagnetic insulator. Physical Review B - Condensed Matter and Materials Physics, 91(11), [115101]. https://doi.org/10.1103/PhysRevB.91.115101

X-ray spectroscopic study of BaFeO3 thin films : An Fe4+ ferromagnetic insulator. / Tsuyama, T.; Matsuda, T.; Chakraverty, S.; Okamoto, J.; Ikenaga, E.; Tanaka, A.; Mizokawa, Takashi; Hwang, H. Y.; Tokura, Y.; Wadati, H.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 91, No. 11, 115101, 02.03.2015.

Research output: Contribution to journalArticle

Tsuyama, T, Matsuda, T, Chakraverty, S, Okamoto, J, Ikenaga, E, Tanaka, A, Mizokawa, T, Hwang, HY, Tokura, Y & Wadati, H 2015, 'X-ray spectroscopic study of BaFeO3 thin films: An Fe4+ ferromagnetic insulator', Physical Review B - Condensed Matter and Materials Physics, vol. 91, no. 11, 115101. https://doi.org/10.1103/PhysRevB.91.115101
Tsuyama, T. ; Matsuda, T. ; Chakraverty, S. ; Okamoto, J. ; Ikenaga, E. ; Tanaka, A. ; Mizokawa, Takashi ; Hwang, H. Y. ; Tokura, Y. ; Wadati, H. / X-ray spectroscopic study of BaFeO3 thin films : An Fe4+ ferromagnetic insulator. In: Physical Review B - Condensed Matter and Materials Physics. 2015 ; Vol. 91, No. 11.
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