@article{5f60a687d51d4396a94147696473c0e4,
title = "Electronic structures and spin states of BaFe2As2 and SrFe2As2 probed by x-ray emission spectroscopy at Fe and As K -absorption edges",
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.",
author = "Hitoshi Yamaoka and Yoshiya Yamamoto and Lin, {Jung Fu} and Wu, {Junjie J.} and Xiancheng Wang and Changqing Jin and Masahiro Yoshida and Seiichiro Onari and Shigeyuki Ishida and Yoshinori Tsuchiya and Nao Takeshita and Nozomu Hiraoka and Hirofumi Ishii and Tsuei, {Ku Ding} and Paul Chow and Yuming Xiao and Jun'Ichiro Mizuki",
note = "Funding Information: The experiments were performed at Taiwan beamlines BL12XU and BL12B2 at SPring-8 under Proposals No. 2015A4254, No. 2015A4128, No. 2015B4262, No. 2016A4256, No. 2016B4262, and No. 2016B4134 (corresponding NSRRC Proposals No. 2015-2-034 and No. 2016-3-095), and 16-ID-D beamline of the APS, ANL. This work at SPring-8 is supported by Grants in Aid for Scientific Research from the Japan Society for the Promotion of Science, KAKENHI No. 15K05194. Portions of this work were performed at HPCAT (Sector16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operation is supported by DOE-NNSA under Award No. DE-NA0001974, with partial instrumentation funding by NSF. The Advanced Photon Source is a US Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. P.C. and Y.X. acknowledge the support of DOE-BES/DMSE under Award No. DE-FG02-99ER45775. Works at IOPCAS are supported by NSF and MOST of China through Research Projects, as well as by CAS External Cooperation Program of BIC (No. 112111KYS820150017). J.-F.L. acknowledges support from HPSTAR. We thank Seika Shonai for help in the experiments at SPring-8. We also appreciate Young-June Kim at the University of Toronto and Hlynur Gretarsson at Max Plank Institute for Solid State Research for the preparation of the FeCrAs sample. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = aug,
day = "22",
doi = "10.1103/PhysRevB.96.085129",
language = "English",
volume = "96",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "8",
}