Anomalous Knight shift and low-energy spin dynamics in the nematic state of FeSe\(_{\rm 1-x}\)S\(_{\rm x}\)

The interplay between the nematic order and magnetism in FeSe is not yet well understood. There is a controversy concerning the relationship between orbital and spin degrees of freedom in FeSe and their relevance for superconductivity. Here we investigate the effect of S substitution on the nematic...

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Bibliographic Details
Published in:arXiv.org 2019-03
Main Authors: Grinenko, V, Dengre, S, Sarkar, R, Chareev, D A, Vasiliev, A N, Efremov, D V, S -L Drechsler, Huehne, R, Nielsch, K, Luetkens, H, H -H Klauss
Format: Article
Language:English
Subjects:
Coupling
Degrees of freedom
Magnetism
NMR
Nuclear magnetic resonance
Single crystals
Spin dynamics
Substitutes
Superconductivity
Transition temperature
Variation
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Summary:The interplay between the nematic order and magnetism in FeSe is not yet well understood. There is a controversy concerning the relationship between orbital and spin degrees of freedom in FeSe and their relevance for superconductivity. Here we investigate the effect of S substitution on the nematic transition temperature (\(T_{\rm n}\)) and the low-energy spin fluctuations (SF) in FeSe single crystals. We show that the low-energy SF emerge below the nematic transition. The difference between the onset temperature for the critical SF (\(T_{\rm SF}\)) and \(T_{\rm n}\) is small for FeSe but significantly increases with S substitution. Below \(T_{\rm SF}\) the Korringa relation is violated and the effective muon hyperfine coupling constant changes a sign. Our results exclude a direct coupling of the low-energy SF to the electronic nematic order indicating a presence of multiple spin degrees of freedom in FeSe\(_{\rm 1-x}\)S\(_{\rm x}\).
ISSN:2331-8422