Gruner, M. E. ; Keune, W. ; Roldan Cuenya, B. ; Weis, C. ; Landers, J. ; Makarov, S. I. ; Klar, D. ; Hu, M. Y. ; Alp, E. E. ; Zhao, J. ; Krautz, M. ; Gutfleisch, O. ; Wende, H. (2015)
Element-Resolved Thermodynamics of Magnetocaloric LaFe13−xSix.
In: Physical Review Letters, 114 (5)
doi: 10.1103/PhysRevLett.114.057202
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
By combination of two independent approaches, nuclear resonant inelastic x-ray scattering and first-principles calculations in the framework of density functional theory, we demonstrate significant changes in the element-resolved vibrational density of states across the first-order transition from the ferromagnetic low temperature to the paramagnetic high temperature phase of LaFe13−xSix. These changes originate from the itinerant electron metamagnetism associated with Fe and lead to a pronounced magneto-elastic softening despite the large volume decrease at the transition. The increase in lattice entropy associated with the Fe subsystem is significant and contributes cooperatively with the magnetic and electronic entropy changes to the excellent magneto- and barocaloric properties.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Gruner, M. E. ; Keune, W. ; Roldan Cuenya, B. ; Weis, C. ; Landers, J. ; Makarov, S. I. ; Klar, D. ; Hu, M. Y. ; Alp, E. E. ; Zhao, J. ; Krautz, M. ; Gutfleisch, O. ; Wende, H. |
| Art des Eintrags: | Bibliographie |
| Titel: | Element-Resolved Thermodynamics of Magnetocaloric LaFe13−xSix |
| Sprache: | Englisch |
| Publikationsjahr: | 4 Februar 2015 |
| Verlag: | APS Publications |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Letters |
| Jahrgang/Volume einer Zeitschrift: | 114 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1103/PhysRevLett.114.057202 |
| Kurzbeschreibung (Abstract): | By combination of two independent approaches, nuclear resonant inelastic x-ray scattering and first-principles calculations in the framework of density functional theory, we demonstrate significant changes in the element-resolved vibrational density of states across the first-order transition from the ferromagnetic low temperature to the paramagnetic high temperature phase of LaFe13−xSix. These changes originate from the itinerant electron metamagnetism associated with Fe and lead to a pronounced magneto-elastic softening despite the large volume decrease at the transition. The increase in lattice entropy associated with the Fe subsystem is significant and contributes cooperatively with the magnetic and electronic entropy changes to the excellent magneto- and barocaloric properties. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Funktionale Materialien 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 10 Feb 2015 09:42 |
| Letzte Änderung: | 10 Feb 2015 09:42 |
| PPN: | |
| Sponsoren: | Funding by the DFG via SPP1239, SPP1599 and SPP1538 is gratefully acknowledged, BRC (RUB/UCF) was funded by the US National Science Foundation (nsf-dmr 1207065), Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE (DE-AC02-06CH11357). |
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