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Contradictory role of the magnetic contribution in inverse magnetocaloric Heusler materials

Gottschall, Tino and Skokov, Konstantin P. and Benke, Dimitri and Gruner, Markus E. and Gutfleisch, Oliver (2016):
Contradictory role of the magnetic contribution in inverse magnetocaloric Heusler materials.
In: Physical Review B, AMER PHYSICAL SOC, 93, (18), ISSN 2469-9950, [Online-Edition: http://dx.doi.org/10.1103/PhysRevB.93.184431],
[Article]

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.

Item Type: Article
Erschienen: 2016
Creators: Gottschall, Tino and Skokov, Konstantin P. and Benke, Dimitri and Gruner, Markus E. and Gutfleisch, Oliver
Title: Contradictory role of the magnetic contribution in inverse magnetocaloric Heusler materials
Language: English
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.

Journal or Publication Title: Physical Review B
Volume: 93
Number: 18
Publisher: AMER PHYSICAL SOC
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 04 Jul 2016 08:01
Official URL: http://dx.doi.org/10.1103/PhysRevB.93.184431
Identification Number: doi:10.1103/PhysRevB.93.184431
Funders: 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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