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; Jun Zhao

doi:10.1038/ncomms12182

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, Jun Zhao

Correlated Electron Materials

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174 Scopus citations

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 (T s =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 â 1/460% larger than that in the iron pnictide BaFe 2 As 2. Our results suggest that FeSe is a novel S=1 nematic quantum-disordered paramagnet interpolating between the Néel and stripe magnetic instabilities.

Original language	English
Article number	12182
Journal	Nature Communications
Volume	7
DOIs	https://doi.org/10.1038/ncomms12182
State	Published - Jul 19 2016

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title = "Magnetic ground state of FeSe",

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 N{\'e}el and stripe magnetic order, respectively. However, FeSe, the structurally simplest iron-based superconductor, shows nematic order (T s =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 N{\'e}el 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 N{\'e}el to the stripe spin fluctuations. Moreover, the total fluctuating magnetic moment of FeSe is {\^a} 1/460% larger than that in the iron pnictide BaFe 2 As 2. Our results suggest that FeSe is a novel S=1 nematic quantum-disordered paramagnet interpolating between the N{\'e}el and stripe magnetic instabilities.",

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T1 - Magnetic ground state of FeSe

AU - Wang, Qisi

AU - Shen, Yao

AU - Pan, Bingying

AU - Zhang, Xiaowen

AU - Ikeuchi, K.

AU - Iida, K.

AU - Christianson, A. D.

AU - Walker, H. C.

AU - Adroja, D. T.

AU - Abdel-Hafiez, M.

AU - Chen, Xiaojia

AU - Chareev, D. A.

AU - Vasiliev, A. N.

AU - Zhao, Jun

PY - 2016/7/19

Y1 - 2016/7/19

N2 - 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 (T s =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 â 1/460% larger than that in the iron pnictide BaFe 2 As 2. Our results suggest that FeSe is a novel S=1 nematic quantum-disordered paramagnet interpolating between the Néel and stripe magnetic instabilities.

AB - 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 (T s =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 â 1/460% larger than that in the iron pnictide BaFe 2 As 2. 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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VL - 7

JO - Nature Communications

JF - Nature Communications

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ER -

Magnetic ground state of FeSe

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