Magnetic moment evolution and spin freezing in doped BaFe 2 As 2

Pelliciari, Jonathan; Huang, Yaobo; Ishii, Kenji; Zhang, Chenglin; Dai, Pengcheng; Chen, Gen Fu; Xing, Lingyi; Wang, Xiancheng; Jin, Changqing; Ding, Hong; Werner, Philipp; Schmitt, Thorsten

doi:10.1038/s41598-017-07286-6

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Journal article

Magnetic moment evolution and spin freezing in doped BaFe 2 As 2

Pelliciari, Jonathan Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, Villigen PSI,Switzerland - Department of Physics, Massachusetts Institute of Technology, Cambridge, USA
Huang, Yaobo Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, Villigen PSI,Switzerland - Beijing National Lab for Condensed Matter Physics, Institute of Physics, Beijing, China
Ishii, Kenji Synchrotron Radiation Research Center, National Institutes for Quantum and Radiological Technology, Hyogo, Japan
Zhang, Chenglin Department of Physics and Astronomy, Rice University, Houston, USA
Dai, Pengcheng Department of Physics and Astronomy, Rice University, Houston, USA
Chen, Gen Fu Beijing National Lab for Condensed Matter Physics, Institute of Physics, Beijing, China
Xing, Lingyi Beijing National Lab for Condensed Matter Physics, Institute of Physics, Beijing, China
Wang, Xiancheng Beijing National Lab for Condensed Matter Physics, Institute of Physics, Beijing, China
Jin, Changqing Beijing National Lab for Condensed Matter Physics, Institute of Physics, Beijing, China - Collaborative Innovation Center for Quantum Matters, Beijing, China
Ding, Hong Beijing National Lab for Condensed Matter Physics, Institute of Physics, Beijing, China
Werner, Philipp Department of Physics, University of Fribourg, Switzerland
Schmitt, Thorsten Research Department Synchrotron Radiation and Nanotechnology, Paul Scherrer Institut, Villigen PSI,Switzerland

14.08.2017

Published in:

Scientific Reports. - 2017, vol. 7, no. 1, p. 8003

English Fe-K β X-ray emission spectroscopy measurements reveal an asymmetric doping dependence of the magnetic moments μbare in electron- and hole-doped BaFe2As2. At low temperature, μbare is nearly constant in hole-doped samples, whereas it decreases upon electron doping. Increasing temperature substantially enhances μbare 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 BaFe2As2, and the inadequacy of a fully localized or fully itinerant description of the 122 family of Fe pnictides.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

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