Neutron Spin Resonance in the 112-Type Iron-Based Superconductor
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
DOI 10.1103/PhysRevLett.120.137001 · Physical Review Letters
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Abstract
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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca0.82La0.18Fe0.96Ni0.04As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
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