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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
; | | Date: |
8 Nov 2015 | | Abstract: | Elucidating the nature of the magnetism of a high-temperature superconductor
is crucial for establishing its pairing mechanism1. The parent compounds of the
cuprate and iron-pnictide superconductors exhibit Neel and stripe magnetic
order, respectively1,2. However, FeSe, the structurally simplest and one of the
most intriguing iron-based superconductors, shows nematic order (Ts = 90 K),
but not magnetic order in the parent phase3, and its magnetic ground state is
intensely debated4-8. Here, we report inelastic neutron-scattering experiments
that reveal both stripe and Neel 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 Neel to the stripe spin fluctuations, which results in
a ~ 30 meV gap in the Neel spin fluctuations. Moreover, although the
spin-fluctuation bandwidth is lower, the total fluctuating magnetic moment of
FeSe is ~ 60% larger than that in the iron pnictide BaFe2As2 (ref. 9). These
results indicate that FeSe is an S=1 nematic quantum-disordered paramagnet
interpolating between the Neel and stripe magnetic instabilities4. Thus, our
findings reveal an unexpected connection between the magnetism of the cuprate-
and iron-based superconductors, and also imply that the Neel spin fluctuations
might be relevant to the unique superconducting properties of FeSe, including
its drastically enhanced superconductivity under pressure, through electron
doping or in the mono layer limit10-13. | | Source: | arXiv, 1511.2485 | | Services: | Forum | Review | PDF | Favorites | |
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