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Zhao et al. Microstructures 2023;3:2023022 Microstructures
DOI: 10.20517/microstructures.2022.46

Research Article Open Access

Low-pressure-driven barocaloric effects at colinear-

to-triangular antiferromagnetic transitions in
Mn Pt 1+x
3-x

1,2
1,2
1,2
1,2
1,2
1,2
1,2
Xueting Zhao , Kun Zhang , Ji Qi , Peng Liu , Zhao Zhang , Lin Qu , Zhidong Zhang , Bing Li 1,2
1
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang
110016, Liaoning, China.
2
School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, Liaoning, China.
Correspondence to: Prof. Bing Li, Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese
Academy of Sciences, 72 Wenhua Road, Shenyang 110016, Liaoning, China. E-mail: bingli@imr.ac.cn; Prof. Kun Zhang, Shenyang
National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road,
Shenyang 110016, Liaoning, China. E-mail: kzhang@imr.ac.cn
How to cite this article: Zhao X, Zhang K, Qi J, Liu P, Zhang Z, Qu L, Zhang Z, Li B. Low-pressure-driven barocaloric effects at
colinear-to-triangular antiferromagnetic transitions in Mn Pt . Microstructures 2023;3:2023022.
3-x
1+x
https://dx.doi.org/10.20517/microstructures.2022.46
Received: 29 Dec 2022 First Decision: 31 Jan 2023 Revised: 23 Mar 2023 Accepted: 21 Apr 2023 Published: 28 Apr 2023
Academic Editor: Fei Li Copy Editor: Fangling Lan Production Editor: Fangling Lan

Abstract
A large driving pressure is required for barocaloric effects (BCEs) in intermetallics, usually above 100 MPa. Here,
we report barocaloric effects in Mn Pt alloys saturated at about 60 MPa, the lowest pressure reported in
1+x
3-x
intermetallics to date. A first-order phase transition occurs from the colinear antiferromagnetic phase to the
triangular antiferromagnetic phase as temperature decreases. The transition temperature strongly depends on the
composition x, ranging from 331 K for x = 0.18 to 384 K for x = 0.04, and is sensitive to pressure, with dT /dP up to
t
-1
-1
139 K/GPa. However, the maximum pressure-induced entropy changes are as small as 13.79 J kg K , attributed to
the mutual cancellation of lattice and magnetic entropy changes. The small driving pressure and total entropy
changes are due to the special magnetic geometric frustration.
Keywords: Barocaloric effects, magnetoelastic coupling, magnetic transition, geometrical spin frustration, colinear
antiferromagnetic

© The Author(s) 2023. Open Access This article is licensed under a Creative Commons Attribution 4.0
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