Magnetic ground state of FeSe

Qisi Wang, Yao Shen, Bingying Pan, Xiaowen Zhang, K. Ikeuchi, K. Iida, A. D. Christianson, H. C. Walker, D. T. Adroja, M. Abdel-Hafiez, Xiaojia Chen, D. A. Chareev, A. N. Vasiliev and Jun Zhao ()
Additional contact information
Qisi Wang: Fudan University
Yao Shen: Fudan University
Bingying Pan: Fudan University
Xiaowen Zhang: Fudan University
K. Ikeuchi: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society
K. Iida: Research Center for Neutron Science and Technology, Comprehensive Research Organization for Science and Society
A. D. Christianson: Oak Ridge National Laboratory
H. C. Walker: ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton
D. T. Adroja: ISIS Facility, Rutherford Appleton Laboratory, STFC, Chilton
M. Abdel-Hafiez: Center for High Pressure Science and Technology Advanced Research
Xiaojia Chen: Center for High Pressure Science and Technology Advanced Research
D. A. Chareev: Institute of Experimental Mineralogy, Russian Academy of Sciences
A. N. Vasiliev: Institute of Physics and Technology, Ural Federal University
Jun Zhao: Fudan University

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract 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.

Date: 2016
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DOI: 10.1038/ncomms12182

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