Low-energy spin excitations in (Li0.8Fe0.2)ODFeSe superconductor studied with inelastic neutron scattering
Mingwei Ma, Lichen Wang, Philippe Bourges, Yvan Sidis, Sergey Danilkin, Yuan Li
DOI 10.1103/PhysRevB.95.100504 · Physical Review B
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Abstract
We report an inelastic neutron scattering study of single crystals of (Li0.8Fe0.2)ODFeSe. Temperature-dependent low-energy spin excitations are observed near Q=(0.5,0.27,0.5) and equivalent wave vectors symmetrically surrounding Q=(0.5,0.5,0.5) in the 1-Fe Brillouin zone, consistent with a Fermi-surface-nesting description. The excitations are broadly distributed in energy, ranging from 16 to 35 meV. Upon cooling below the superconducting critical temperature (Tc), a magnetic response below twice the superconducting gap 2ΔSC exhibits an abrupt enhancement, consistent with the notion of spin resonance, whereas the response at higher energies increases more gradually with only a weak anomaly at Tc. Our results suggest that (Li0.8Fe0.2)ODFeSe might be on the verge of a crossover between different Cooper-pairing channels with distinct symmetries.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Li0.8Fe0.2)ODFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | onset |
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