Faske, Tom ; Radulov, Iliya Angelov ; Hölzel, Markus ; Gutfleisch, Oliver ; Donner, Wolfgang (2021)
Direct observation of paramagnetic spin fluctuations in LaFe₁₃₋ₓ Siₓ.
In: Journal of Physics: Condensed Matter, 2021, 32 (11)
doi: 10.26083/tuprints-00019331
Artikel, Zweitveröffentlichung, Verlagsversion
 | Es ist eine neuere Version dieses Eintrags verfügbar. |
Kurzbeschreibung (Abstract)
Spin fluctuations are a crucial driving force for magnetic phase transitions, but their presence usually is indirectly deduced from macroscopic variables like volume, magnetization or electrical resistivity. Here we report on the direct observation of spin fluctuations in the paramagnetic regime of the magnetocaloric model system LaFe₁₁.₆Si₁.₄ in the form of neutron diffuse scattering. To confirm the magnetic origin of the diffuse scattering, we correlate the temperature dependence of the diffuse intensity with ac magnetic susceptibility and x-ray diffraction experiments under magnetic field. Strong spin fluctuations are already observable at 295K and their presence alters the thermal contraction behavior of LaFe₁₁.₆Si₁.₄ down to the Curie temperature of the first-order magneto-structural transition at 190K. We explain the influence of the spin fluctuation amplitude on the lattice parameter in the framework of the internal magnetic pressure model and find that the critical forced magnetostriction follows Takashi’s spin fluctuation theory for itinerant electron systems.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Faske, Tom ; Radulov, Iliya Angelov ; Hölzel, Markus ; Gutfleisch, Oliver ; Donner, Wolfgang |
| Art des Eintrags: | Zweitveröffentlichung |
| Titel: | Direct observation of paramagnetic spin fluctuations in LaFe₁₃₋ₓ Siₓ |
| Sprache: | Englisch |
| Publikationsjahr: | 2021 |
| Publikationsdatum der Erstveröffentlichung: | 2021 |
| Verlag: | IOP Publishing |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Physics: Condensed Matter |
| Jahrgang/Volume einer Zeitschrift: | 32 |
| (Heft-)Nummer: | 11 |
| Kollation: | 10 Seiten |
| DOI: | 10.26083/tuprints-00019331 |
| URL / URN: | https://tuprints.ulb.tu-darmstadt.de/19331 |
| Zugehörige Links: | |
| Herkunft: | Zweitveröffentlichung aus gefördertem Golden Open Access |
| Kurzbeschreibung (Abstract): | Spin fluctuations are a crucial driving force for magnetic phase transitions, but their presence usually is indirectly deduced from macroscopic variables like volume, magnetization or electrical resistivity. Here we report on the direct observation of spin fluctuations in the paramagnetic regime of the magnetocaloric model system LaFe₁₁.₆Si₁.₄ in the form of neutron diffuse scattering. To confirm the magnetic origin of the diffuse scattering, we correlate the temperature dependence of the diffuse intensity with ac magnetic susceptibility and x-ray diffraction experiments under magnetic field. Strong spin fluctuations are already observable at 295K and their presence alters the thermal contraction behavior of LaFe₁₁.₆Si₁.₄ down to the Curie temperature of the first-order magneto-structural transition at 190K. We explain the influence of the spin fluctuation amplitude on the lattice parameter in the framework of the internal magnetic pressure model and find that the critical forced magnetostriction follows Takashi’s spin fluctuation theory for itinerant electron systems. |
| Status: | Verlagsversion |
| URN: | urn:nbn:de:tuda-tuprints-193310 |
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 600 Technik |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien |
| Hinterlegungsdatum: | 06 Sep 2021 12:13 |
| Letzte Änderung: | 13 Sep 2021 06:34 |
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| Suche nach Titel in: | TUfind oder in Google |
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- Direct observation of paramagnetic spin fluctuations in LaFe₁₃₋ₓ Siₓ. (deposited 06 Sep 2021 12:13) [Gegenwärtig angezeigt]
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