Multisite exchange-enhanced barocaloric response in Mn3NiN

Boldrin, D. et al. (2018) Multisite exchange-enhanced barocaloric response in Mn3NiN. Physical Review X, 8(4), 041035. (doi: 10.1103/PhysRevX.8.041035)

Abstract

We study the barocaloric effect (BCE) in the geometrically frustrated antiferromagnet Mn 3 NiN across the Néel transition temperature. Experimentally, we find a larger barocaloric entropy change by a factor of 1.6 than that recently discovered in the isostructural antiperovskite Mn 3 GaN despite significantly greater magnetovolume coupling in Mn 3 GaN . By fitting experimental data to theory, we show that the larger BCE of Mn 3 NiN originates from multisite exchange interactions amongst the local Mn magnetic moments and their coupling with itinerant electron spins. Using this framework, we discuss the route to maximize the BCE in the wider Mn 3 A N family.

• Item Type: Articles
• Additional Information: This work is supported by EPSRC (UK) Grants No. EP/P511109/ 1, No. EP/P030548/1, No. EP/J006750/1, and No. EP/ M028941/1, MINECO (Spain) Projects No. FIS2014- 54734-P, No. 2017SGR-42 (Catalan government), and ERC Starting Grant No. 680032. X. M. is grateful for support from the Royal Society.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Boldrin, Dr David
• Authors: Boldrin, D., Mendive-Tapia, E., Zemen, J., Staunton, J. B., Hansen, T., Aznar, A., Tamarit, J.-L., Barrio, M., Lloveras, P., Kim, J., Moya, X., and Cohen, L. F.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review X
• Publisher: American Physical Society
• ISSN: 2160-3308
• ISSN (Online): 2160-3308
• Published Online: 28 November 2018
• Copyright Holders: Copyright © 2018 The Authors
• First Published: First published in Physical Review X 8(4): 041035
• Publisher Policy: Reproduced under a Creative Commons License