Journal Article Magnetic moment evolution and spin freezing in doped BaFe2As2

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

7pp.8003-1 - 8003-8 , 2017-09 , Springer Nature
Fe-Kβ 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’scoupling and electronic correlations, especially for hole-doped BaFe2As2, and the inadequacy of a fullylocalized or fully itinerant description of the 122 family of Fe pnictides.

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