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Title: Magnetic moment evolution and spin freezing in doped BaFe2As2

Fe-K β X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μ bare in electron- and hole-doped BaFe 2As 2. At low temperature, μ bare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μ bare in the hole-doped region, which is naturally explained by the theoretically predicted crossover into a spin-frozen state. Our measurements demonstrate the importance of Hund’s-coupling and electronic correlations, especially for hole-doped BaFe 2As 2, as well as the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides.
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Publication Date:
Grant/Contract Number:
SC0012311; C-1893
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Kabelwerke Brugg AG Holding (Switzerland); Univ. of Applied Sciences Northwestern Switzerland (FHNW); Paul Scherrer Inst. (PSI); Swiss National Science Foundation (SNSF); Japan Synchrotron Radiation Research Inst. (JASRI); Swiss Federal Inst. of Technology in Zurich (Switzerland); Rice Univ., Houston, TX (United States)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Magnetic properties and materials; Superconducting properties and materials
OSTI Identifier: