title: Effect of Nematic Order on the Low-Energy Spin Fluctuations in Detwinned BaFe_{1.935}Ni_{0.065}As_{2}.
abstract: The origin of nematic order remains one of the major debates in iron-based superconductors. In theories based on spin nematicity, one major prediction is that the spin-spin correlation length at (0,π) should decrease with decreasing temperature below the structural transition temperature T_{s}. Here, we report inelastic neutron scattering studies on the low-energy spin fluctuations in BaFe_{1.935}Ni_{0.065}As_{2} under uniaxial pressure. Both intensity and spin-spin correlation start to show anisotropic behavior at high temperature, while the reduction of the spin-spin correlation length at (0,π) happens just below T_{s}, suggesting the strong effect of nematic order on low-energy spin fluctuations. Our results favor the idea that treats the spin degree of freedom as the driving force of the electronic nematic order.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Wenliang
authors.initials: W
authors.lastname: Zhang
authors.affiliation: Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, D-85748 Garching, Germany.
authors.forename: J T
authors.initials: JT
authors.lastname: Park
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xingye
authors.initials: X
authors.lastname: Lu
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wei
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Xiaoyan
authors.initials: X
authors.lastname: Ma
authors.affiliation: China Institute of Atomic Energy, Beijing 102413, China.
authors.forename: Lijie
authors.initials: L
authors.lastname: Hao
authors.affiliation: Department of Physics and Astronomy, Rice University, Houston, Texas 77005-1827, USA.
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Dai
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Zi Yang
authors.initials: ZY
authors.lastname: Meng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100190, China.|School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Yi-Feng
authors.initials: YF
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Huiqian
authors.initials: H
authors.lastname: Luo
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.|Collaborative Innovation Center of Quantum Matter, Beijing 100190, China.|School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China.
authors.forename: Shiliang
authors.initials: S
authors.lastname: Li