Journal Article

IMPULSE-2024-00198

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Ferromagnetic interlayer coupling in FeSe$_{1 − x}$S$_{x}$ superconductors revealed by inelastic neutron scattering

Ma, M. (Corresponding author) ; Bourges, P. ; Sidis, Y. ; Sun, J. ; Wang, G. ; Iida, K. ; Kamazawa, K. ; Park, J. T.MLZ* ; Bourdarot, F. ; Ren, Z. ; Li, Y.

2024
Inst. Woodbury, NY

Please use a persistent id in citations: doi:10.1103/PhysRevB.110.174503

Abstract: FeSe1−𝑥⁢S𝑥 superconductors are commonly considered layered van der Waals materials with negligible interlayer coupling. Here, using inelastic neutron scattering to study spin excitations in single-crystal samples, we reveal that the magnetic coupling between adjacent Fe layers is ferromagnetic in nature, making the system different from most unconventional superconductors including iron pnictides. The weak interlayer coupling is estimated to be 𝐽𝑐∼ 0.2 meV, in agreement with the short spin-spin correlation length 𝜉𝑐∼0.2⁢𝑐 along the 𝑐 axis. The results provide an experimental basis for establishing a microscopic theoretical model to describe the absence of magnetic order in FeSe1−𝑥⁢S𝑥.

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

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Contributing Institute(s):

1. PUMA (PUMA)
2. QUANTUM (QUANTUM)

Experiment(s):

1. PUMA: Thermal three axes spectrometer (SR7)

Appears in the scientific report 2024

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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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