Journal Article

FZJ-2023-00578

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Low-energy spin fluctuations in FeSe 0.95 S 0.05

Hu, D. ; Wang, Q. (Corresponding author)Extern* ; Wo, H. ; Schneidewind, A.FZJ* ; Zhao, J. (Corresponding author)

2022
Inst. Woodbury, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/33550  doi:10.1103/PhysRevB.106.214522

Abstract: 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.

Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Heinz Maier-Leibnitz Zentrum (MLZ)
3. Streumethoden (JCNS-2)
4. JCNS-4 (JCNS-4)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4) (POF4-6G4)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)

Appears in the scientific report 2022

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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