Spin correlations in (Mn,Fe)2(P,Si) magnetocaloric compounds above Curie temperature
Xue-fei Miao (TU Delft - RST/Fundamental Aspects of Materials and Energy)
L Caron (Max Planck Institute for Chemical Physics of Solids)
P. C M Gubbens (TU Delft - RST/Fundamental Aspects of Materials and Energy)
A. Yaouanc (Université Grenoble Alpes)
P Dalmas de Réotier (Université Grenoble Alpes)
H. Luetkens (Paul Scherrer Institut)
A Amato (Paul Scherrer Institut)
Niels Harmen H. Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)
E. H. Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)
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Abstract
The longitudinal-field muon-spin relaxation (LF-μSR) technique was employed to study the spin correlations in (Mn,Fe)2(P,Si) compounds above the ferromagnetic transition temperature (TC). The (Mn,Fe)2(P,Si) compound under study is found to show itinerant magnetism. The standard deviation of the magnetic field distribution of electronic origin increases with a decrease in temperature, which is attributed to the development of spin correlations. The anomalously low magnetic fluctuation rate is suggested to be another signature of the spin correlations. The development of pronounced magnetic fluctuations is in agreement with the observed deviation of the paramagnetic susceptibility from Curie–Weiss behavior. Our study sheds light on the magneto-elastic transition and the mixed magnetism in (Mn,Fe)2(P,Si) compounds.
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