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Article Dans Une Revue Physical Review Letters Année : 2018

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

Résumé

We use inelastic neutron scattering to study the low-energy spin excitations of the 112-type iron pnictide Ca$_{0.82}$La$_{0.18}$Fe$_{0.96}$Ni$_{0.04}$As$_2$ with bulk superconductivity below $T_c$ = 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 $T_c$ 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 4$p$ orbitals contribute to a three-dimensional hole pocket around the $\Gamma$ 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 $k_z$ 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.
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Dates et versions

hal-01938402 , version 1 (11-04-2019)

Identifiants

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Tao Xie, Dongliang Gong, Haranath Ghosh, Abyay Ghosh, Minoru Soda, et al.. Neutron Spin Resonance in the 112-Type Iron-Based Superconductor. Physical Review Letters, 2018, 120 (13), pp.137001. ⟨10.1103/PhysRevLett.120.137001⟩. ⟨hal-01938402⟩
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