Low-energy spin excitations in the optimally doped CaFe0.88Co0.12AsF superconductor studied with inelastic neutron scattering
Mingwei Ma, Philippe Bourges, Yvan Sidis, Alexandre Ivanov, Genfu Chen, Zhian Ren, Yuan Li
DOI 10.1103/PhysRevB.107.184516 · Physical Review B
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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 single-crystal 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 iron-based 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe0.88Co0.12AsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
| CaFe0.88Co0.12AsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
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