Journal
PHYSICAL REVIEW B
Volume 106, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.214522
Keywords
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Funding
- Key Program of National Natural Science Foundation of China [12234006]
- General Program of National Natural Science Foundation of China [11874119]
- National Key R&D Program of China [2022YFA1403202]
- Shanghai Municipal Science and Technology Major Project [2019SHZDZX01]
- China National Postdoctoral Program for Innovative Talents [BX2021080]
- China Postdoctoral Science Foundation [2020M700860]
- Shanghai Post-doctoral Excellence Program [2021481]
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We report inelastic neutron scattering measurements of low-energy spin fluctuations in FeSe0.95S0.05 (Tc = 10 K). Our experiments revealed a resonance mode at 3.5 meV, accompanied by a spin gap below 3 meV at the stripe wave vector in the superconducting state. An abrupt enhancement of stripe spin fluctuations is found below a nematic ordering temperature of Ts = 80 K.
We report inelastic neutron scattering measurements of low-energy spin fluctuations in FeSe0.95S0.05 (Tc = 10 K). Our experiments revealed a resonance mode at 3.5 meV, accompanied by a spin gap below 3 meV at the stripe wave vector in the superconducting state. The resonance mode is sharp in energy and appears at an energy level considerably lower than the superconducting gap, implying that the mode is a bound spin exciton below the superconducting gap rather than an enhanced paramagnon. An abrupt enhancement of stripe spin fluctuations is found below a nematic ordering temperature of Ts = 80 K. These results indicate that the direct coupling between the stripe spin fluctuations, nematicity, and superconductivity persists in sulfur doped FeSe, where superconductivity is enhanced and nematicity is partially suppressed.
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