X-ray absorption spectroscopy study on h-LuFeO$_{3}$ and h-YbFeO$_{3}$

ORAL

Abstract

We have studied the unoccupied electronic band structure of the hexagonal ferrites h-LuFeO$_{3}$ and h-YbFeO$_{3}$ using the absorption spectroscopy obtained with linearly polarized soft X-ray synchrotron radiation. The shapes of the spectra have been analyzed in terms of the splitting of atomic energy levels in various crystal fields corresponding to the local symmetry of the different atomic sites. Significant hybridization between O-2p and various iron and rare earth orbitals (such as Fe-3d, Lu/Yb-5d and Yb-4f) have been observed. The spectral weight contributions to the electronic states near the bottom of the conduction band are found to consist of Fe-3d, Lu/Yb-5d, and Yb-4f as relatively narrow bands, as well as a wide O-2p band covering much of the measured energy range. The results are consistent with the density functional theory calculation including onsite-Coulomb repulsion corrections in terms of Hubbard U.

*The project was supported by SRC-NRI Center under Task ID 2398.001, by NSF through Nebraska MRSEC DMR-0820521, DMR 0747704, and by Nebraska EPSCoR.

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Authors

  • Xiaoshan Xu

    • University of Nebraska-Lincoln,Nebraska Center for Materials and Nanoscience

  • Shi Cao

    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience
    • Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA

  • Tula Paudel

    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience

  • Kishan Sinha

    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience

  • Xuanyuan Jiang

    • Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588, USA
    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience

  • Wenbin Wang

    • Fudan University

  • Jian Wang

    • Canadian Light Source

  • Evgeny Y. Tsymbal

    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience
    • Department of Physics and Astronomy and Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA
    • Univ of Nebraska - Lincoln
    • Department of Physics and Astronomy \& Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588
    • University of Nebraska-Lincoln
    • University of Nebraska - Lincoln

  • Peter Dowben

    • University of Nebraska-Lincoln, Nebraska Center for Materials and Nanoscience
    • Univ of Nebraska - Lincoln, Dept. of Physics and Astronomy
    • University of Nebraska - Lincoln