Gottschall, Tino ; Skokov, Konstantin P. ; Benke, Dimitri ; Gruner, Markus E. ; Gutfleisch, Oliver (2016)
Contradictory role of the magnetic contribution in inverse magnetocaloric Heusler materials.
In: Physical Review B, 93 (18)
doi: 10.1103/PhysRevB.93.184431
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
In this paper, we illustrate the dilemma of inverse magnetocaloric materials using the example of Heusler alloys. For such materials, the magnetic and lattice contribution to the total entropy change are competing with each other. For the two paradigmatic Heusler systems of Ni-Mn-In and Ni-Mn-In-Co, we provide a systematic comparison of experimental data under different magnetic fields and hydrostatic pressures with magnetic and the magnetocaloric properties obtained from the Heisenberg model. This allows us to separate the lattice and the magnetic contribution to the total entropy of the martensitic transition. Our analysis reveals that a large magnetization change is parasitic, but at the same time it is necessary to drive the magnetocaloric effect. This contradicting role of the magnetic contribution-the dilemma-is a general characteristic of inverse magnetocaloric Heusler materials.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2016 |
| Autor(en): | Gottschall, Tino ; Skokov, Konstantin P. ; Benke, Dimitri ; Gruner, Markus E. ; Gutfleisch, Oliver |
| Art des Eintrags: | Bibliographie |
| Titel: | Contradictory role of the magnetic contribution in inverse magnetocaloric Heusler materials |
| Sprache: | Englisch |
| Publikationsjahr: | 25 Mai 2016 |
| Verlag: | AMER PHYSICAL SOC |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review B |
| Jahrgang/Volume einer Zeitschrift: | 93 |
| (Heft-)Nummer: | 18 |
| DOI: | 10.1103/PhysRevB.93.184431 |
| Kurzbeschreibung (Abstract): | In this paper, we illustrate the dilemma of inverse magnetocaloric materials using the example of Heusler alloys. For such materials, the magnetic and lattice contribution to the total entropy change are competing with each other. For the two paradigmatic Heusler systems of Ni-Mn-In and Ni-Mn-In-Co, we provide a systematic comparison of experimental data under different magnetic fields and hydrostatic pressures with magnetic and the magnetocaloric properties obtained from the Heisenberg model. This allows us to separate the lattice and the magnetic contribution to the total entropy of the martensitic transition. Our analysis reveals that a large magnetization change is parasitic, but at the same time it is necessary to drive the magnetocaloric effect. This contradicting role of the magnetic contribution-the dilemma-is a general characteristic of inverse magnetocaloric Heusler materials. |
| 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: | 04 Jul 2016 08:01 |
| Letzte Änderung: | 04 Jul 2016 08:01 |
| PPN: | |
| Sponsoren: | This work was supported by DFG (Grant No. SPP 1599)., We want to thank the Darmstadt Graduate School of Excellence Energy Science and Engineering for providing a PhD-grant (D.B.). |
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