Negative magnetocaloric effect from highly sensitive metamagnetism in CoMnSi_{1-x}Ge_{x}
K.G. Sandeman (1), R. Daou (2), S. Ozcan (2), J.H. Durrell (1), N.D., Mathur (1), D.J. Fray (1) ((1) Dept. of Materials Science, Metallurgy,, University of Cambridge, UK, (2) Quantum Matter Group, Cavendish Laboratory,, Cambridge, UK)
TL;DR
This paper reports a novel negative magnetocaloric effect in CoMnSi_{1-x}Ge_{x} caused by a metamagnetic transition, with potential applications in magnetic refrigeration across various temperatures.
Contribution
It introduces a new negative magnetocaloric effect linked to a metamagnetic transition in CoMnSi_{1-x}Ge_{x}, tunable by pressure and composition.
Findings
Negative magnetocaloric effect observed in CoMnSi_{1-x}Ge_{x}
High shift in transition temperature with magnetic field
Tunable magnetic properties via pressure and composition
Abstract
We report a novel negative magnetocaloric effect in CoMnSi_{1-x}Ge_{x} arising from a metamagnetic magnetoelastic transition. The effect is of relevance to magnetic refrigeration over a wide range of temperature, including room temperature. In addition we report a very high shift in the metamagnetic transition temperature with applied magnetic field. This is driven by competition between antiferromagnetic and ferromagnetic order which can be readily tuned by applied pressure and compositional changes.
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