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Multisite Exchange-Enhanced Barocaloric Response in Mn3NiN

Published version
Peer-reviewed

Type

Article

Change log

Authors

Boldrin, D 
Mendive-Tapia, E 
Zemen, J 
Staunton, JB 
Hansen, T 

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.

Description

Keywords

51 Physical Sciences, 5103 Classical Physics

Journal Title

Physical Review X

Conference Name

Journal ISSN

2160-3308
2160-3308

Volume Title

8

Publisher

American Physical Society (APS)
Sponsorship
The Royal Society (uf120210)
European Research Council (680032)
Royal Society (URF\R\180035)