Multisite Exchange-Enhanced Barocaloric Response in Mn3NiN

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Authors
Boldrin, D
Mendive-Tapia, E
Zemen, J
Staunton, JB
Hansen, T
Aznar, A
Tamarit, JL
Publication Date
2018-11-28
Journal Title
Physical Review X
ISSN
2160-3308
Publisher
American Physical Society (APS)
Volume
8
Issue
4
Type
Article
This Version
VoR
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Citation
Boldrin, D., Mendive-Tapia, E., Zemen, J., Staunton, J., Hansen, T., Aznar, A., Tamarit, J., et al. (2018). Multisite Exchange-Enhanced Barocaloric Response in Mn3NiN. Physical Review X, 8 (4) https://doi.org/10.1103/PhysRevX.8.041035
Abstract
We have studied the barocaloric effect (BCE) in the geometrically frustrated antiferromagnet Mn3NiN across the N eel transition temperature. Experimentally we and a larger barocaloric entropy change by a factor of 1.6 than that recently discovered in the isostructural antiperovskite Mn3GaN despite signi cantly greater magnetovolume coupling in the latter. By tting experimental data to theory we show that the larger BCE of Mn3NiN originates from multi-site exchange interactions amongst the local Mn magnetic moments and their coupling with itinerant electron spins. Using this framework, we discuss the route to maximise the BCE in the wider Mn3AN family.
Sponsorship
The Royal Society (uf120210)
European Research Council (680032)
Royal Society (URF\R\180035)
Identifiers
External DOI: https://doi.org/10.1103/PhysRevX.8.041035
This record's URL: https://www.repository.cam.ac.uk/handle/1810/287382
Rights
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/
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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International