@article{e57f8509e3b944a6b819c2fb1dd0513f,
title = "Orbital order and fluctuations in the two-leg ladder materials BaFe2X3 (X= S and Se) and CsFe2Se3",
abstract = "The electronic structure of BaFe2X3 (X = S and Se) and CsFe2Se3 in which two-leg ladders are formed by the Fe sites are studied by means of x-ray absorption and resonant inelastic x-ray scattering spectroscopy. The x-ray absorption spectra at the Fe L edges for BaFe2X3 exhibit two components, indicating that itinerant and localized Fe 3d sites coexist. Substantial x-ray linear dichroism is observed in polarization dependent spectra, indicating the existence of orbital order or fluctuation in the Fe ladder even above the N{\'e}el temperature TN. Direct exchange interaction along the legs of the Fe ladder stabilizes the orbital and antiferromagnetic orders in BaFe2S3, while the ferromagnetic molecular orbitals are realized between the rungs in CsFe2Se3.",
author = "Kou Takubo and Yuichi Yokoyama and Hiroki Wadati and Shun Iwasaki and Takashi Mizokawa and Teak Boyko and Ronny Sutarto and Feizhou He and Kazuki Hashizume and Satoshi Imaizumi and Takuya Aoyama and Yoshinori Imai and Kenya Ohgushi",
note = "Funding Information: The authors thank Dr. D. Ootsuki and Dr. Y. Hirata for valuable discussions. Research described in this paper was performed at the Canadian Light Source, which is supported by the Canada Foundation for Innovation, Natural Sciences and Engineering Research Council of Canada, the University of Saskatchewan, the Government of Saskatchewan, Western Economic Diversification Canada, the National Research Council Canada, and the Canadian Institutes of Health Research. This work was supported by the Japan Society for the Promotion of Science (JSPS) of Grant-in-Aid for Young Scientists (B) (Grant No. 16K20997) and for Scientific Research (B) (Grant No. 16H04019). This work was also partially supported by Ministry of Education, Culture, Sports, Science, and Technology of Japan (X-ray Free Electron Laser Priority Strategy Program) and Mitsubishi Foundation. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",
year = "2017",
month = sep,
day = "27",
doi = "10.1103/PhysRevB.96.115157",
language = "English",
volume = "96",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "11",
}