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Magnetic ground state of FeSe

Article scientifique 2016 Anglais

Résumé

Elucidating the nature of the magnetism of a high-temperature superconductor is crucial for establishing its pairing mechanism. The parent compounds of the cuprate and iron-pnictide superconductors exhibit Néel and stripe magnetic order, respectively. However, FeSe, the structurally simplest iron-based superconductor, shows nematic order (Ts=90 K), but not magnetic order in the parent phase, and its magnetic ground state is intensely debated. Here we report inelastic neutron-scattering experiments that reveal both stripe and Néel spin fluctuations over a wide energy range at 110 K. On entering the nematic phase, a substantial amount of spectral weight is transferred from the Néel to the stripe spin fluctuations. Moreover, the total fluctuating magnetic moment of FeSe is ∼60% larger than that in the iron pnictide BaFe2As2. Our results suggest that FeSe is a novel S=1 nematic quantum-disordered paramagnet interpolating between the Néel and stripe magnetic instabilities.

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Wang, Q., Shen, Y., Pan, B., Zhang, X., Ikeuchi, K., Iida, K., Christianson, A., Walker, H., Adroja, D., Abdel-Hafiez, M., Chen, X., Чареев, Д., Vasiliev, A., Zhao, J. (2016). Magnetic ground state of FeSe. https://doi.org/10.1038/ncomms12182

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Auteur(s)

Qisi Wang Yao Shen Bingying Pan Xiaowen Zhang Kazuhiko Ikeuchi Kazuki Iida A. D. Christianson H. C. Walker D. T. Adroja Mahmoud Abdel-Hafiez Xiao‐Jia Chen Д. А. Чареев A. N. Vasiliev Jun Zhao

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