論文

査読有り
2018年3月27日

Neutron Spin Resonance in the 112-Type Iron-Based Superconductor

Physical Review Letters
  • Tao Xie
  • Dongliang Gong
  • Haranath Ghosh
  • Abyay Ghosh
  • Minoru Soda
  • Takatsugu Masuda
  • Shinichi Itoh
  • Frédéric Bourdarot
  • Louis-Pierre Regnault
  • Sergey Danilkin
  • Shiliang Li
  • Huiqian Luo
  • 全て表示

120
13
開始ページ
137001
終了ページ
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevLett.120.137001
出版者・発行元
American Physical Society

We use inelastic neutron scattering to study the low-energy spin excitations of the 112-type iron pnictide Ca0.82La0.18Fe0.96Ni0.04As2 with bulk superconductivity below Tc=22 K. A two-dimensional spin resonance mode is found around E=11 meV, where the resonance energy is almost temperature independent and linearly scales with Tc along with other iron-based superconductors. Polarized neutron analysis reveals the resonance is nearly isotropic in spin space without any L modulations. Because of the unique monoclinic structure with additional zigzag arsenic chains, the As 4p orbitals contribute to a three-dimensional hole pocket around the Γ point and an extra electron pocket at the X point. Our results suggest that the energy and momentum distribution of the spin resonance does not directly respond to the kz dependence of the fermiology, and the spin resonance intrinsically is a spin-1 mode from singlet-triplet excitations of the Cooper pairs in the case of weak spin-orbital coupling.

リンク情報
DOI
https://doi.org/10.1103/PhysRevLett.120.137001
ID情報
  • DOI : 10.1103/PhysRevLett.120.137001
  • ISSN : 1079-7114
  • ISSN : 0031-9007
  • SCOPUS ID : 85044731270

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