Multisite Exchange-Enhanced Barocaloric Response in Mn3NiN
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Peer-reviewed
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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.
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Keywords
51 Physical Sciences, 5103 Classical Physics
Journal Title
Physical Review X
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Journal ISSN
2160-3308
2160-3308
2160-3308
Volume Title
8
Publisher
American Physical Society (APS)
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Sponsorship
The Royal Society (uf120210)
European Research Council (680032)
Royal Society (URF\R\180035)
European Research Council (680032)
Royal Society (URF\R\180035)