Low-energy spin excitations in the optimally doped CaFe 0.88 Co 0.12 AsF superconductor studied with inelastic neutron scattering - Archive ouverte HAL Access content directly
Journal Articles Physical Review B Year : 2023

Low-energy spin excitations in the optimally doped CaFe 0.88 Co 0.12 AsF superconductor studied with inelastic neutron scattering

Mingwei Ma
  • Function : Author
Philippe Bourges
Alexandre Ivanov
Genfu Chen
  • Function : Author
Zhian Ren

Abstract

There are few inelastic neutron scattering (INS) reports on the superconducting single crystals of the FeAs-1111 system, even though it was first discovered in 2008, due to the extreme difficulty in large singlecrystal growth. In this paper, we have studied the low-energy spin excitations in optimally electron-doped CaFe0.88Co0.12AsF single crystals with Tc = 21 K by INS. The resonance energy of the superconducting spin resonant mode with Er = 12 meV amounts to 6.6kBTc, which constitutes a large Er/kBTc ratio among ironbased superconductors. The large ratio implies a strong coupling between conduction electrons and magnetic excitations in CaFe0.88Co0.12AsF. The resonance possesses a magnonlike upward dispersion along the transverse direction due to the anisotropy of the spin-spin correlation length within the ab plane in the normal state, which points to a spin fluctuation mediated sign-reversed s± wave pairing in CaFe0.88Co0.12AsF
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Dates and versions

hal-04235253 , version 1 (10-10-2023)

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Mingwei Ma, Philippe Bourges, Yvan Sidis, Alexandre Ivanov, Genfu Chen, et al.. Low-energy spin excitations in the optimally doped CaFe 0.88 Co 0.12 AsF superconductor studied with inelastic neutron scattering. Physical Review B, 2023, 107 (18), pp.184516. ⟨10.1103/PhysRevB.107.184516⟩. ⟨hal-04235253⟩
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