Electronic structures and spin states of BaFe2As2 and SrFe2As2 probed by x-ray emission spectroscopy at Fe and As K -absorption edges

Hitoshi Yamaoka, Yoshiya Yamamoto, Jung Fu Lin, Junjie J. Wu, Xiancheng Wang, Changqing Jin, Masahiro Yoshida, Seiichiro Onari, Shigeyuki Ishida, Yoshinori Tsuchiya, Nao Takeshita, Nozomu Hiraoka, Hirofumi Ishii, Ku Ding Tsuei, Paul Chow, Yuming Xiao, Jun'Ichiro Mizuki

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Abstract

Electronic structures of electron- and hole-doped BaFe2As2 and nondoped SrFe2As2 have been studied systematically by x-ray emission spectroscopy at Fe and As K-absorption edges. The electron and hole doping causes slight increase of the integrated absolute difference (IAD) values of the Fe Kβ x-ray emission spectra which correlate to the local magnetic moment. Pressure decreases the IAD values and local magnetic moment, and induces the lower-spin states in these compounds. The pre-edge peak intensity of the XAS spectra at the Fe K-absorption edge increases with pressure in both compounds. This indicates an increase of the Fe 3d-As 4p hybridization. It was found that pressure induced a discontinuous increase of the prepeak intensity of the PFY-XAS spectra at the As K-absorption edge at low pressures in the BaFe2As2 systems. Our results may suggest that the Fe 3d-As 4p hybridization plays a key role in suppressing the AFM order by the doping or pressure and fluctuation of the local magnetic moment and the electron-electron correlation may also play a role on the physical properties of the iron superconductors.

Original languageEnglish
Article number085129
JournalPhysical Review B
Volume96
Issue number8
DOIs
Publication statusPublished - Aug 22 2017

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Yamaoka, H., Yamamoto, Y., Lin, J. F., Wu, J. J., Wang, X., Jin, C., Yoshida, M., Onari, S., Ishida, S., Tsuchiya, Y., Takeshita, N., Hiraoka, N., Ishii, H., Tsuei, K. D., Chow, P., Xiao, Y., & Mizuki, JI. (2017). Electronic structures and spin states of BaFe2As2 and SrFe2As2 probed by x-ray emission spectroscopy at Fe and As K -absorption edges. Physical Review B, 96(8), [085129]. https://doi.org/10.1103/PhysRevB.96.085129