Multi-site exchange enhanced barocaloric response in Mn${}_3$NiN

Abstract

We have studied 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 greater magnetovolume coupling in the latter. By fitting experimental data to theory we show that the larger BCE of Mn${}_3$NiN 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 Mn${}_3$AN family.

References in corpus (9)

• Mixed Magnetism for Refrigeration and Energy Conversion
• Correlation between magnetism and magnetocaloric effect in RCo2-based Laves phase compounds
• Barocaloric and Magnetocaloric Effects in Fe49Rh51
• Fluctuating local moments, itinerant electrons and the magnetocaloric effect: the compositional hypersensitivity of FeRh
• Element-resolved thermodynamics of magnetocaloric LaFe${}_{13-x}$Si${}_x$
• Piezomagnetic effect as a counterpart of negative thermal expansion in magnetically frustrated Mn-based antiperovskite nitrides
• Theory of magnetic ordering in the heavy rare earths: ab-initio electronic origin of pair- and four- spin interactions
• Frustrated Magnetism and Caloric Effects in Mn-antiperovskite Nitrides: $AbInitio$ Theory
• Magneto- and Baro- Caloric Responses in Magnetovolumic Systems

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• Ab initio theory of the Gibbs free energy and a hierarchy of local moment correlation functions in itinerant electron systems: The magnetism of Mn${}_3$A materials class
• First-order ferromagnetic transitions of lanthanide local moments in divalent compounds: An itinerant electron positive feedback mechanism and Fermi surface topological change
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• Quantification of electronic and magnetoelastic mechanisms of first-order magnetic phase transitions from first principles: application to caloric effects in La(Fe${}_x$Si${}_{1-x}$)${}_{13}$
• Epitaxial growth and orientation-dependent anomalous Hall effect of noncollinear antiferromagnetic Mn${}_3$Ni${}_{0.35}$Cu${}_{0.65}$N films
• Chiral magnetism, lattice dynamics, and anomalous Hall conductivity in the novel V${}_3$AuN antiferromagnetic antiperovskite