Low-pressure-driven barocaloric effects at colinear-to-triangular antiferromagnetic transitions in Mn3-xPt1+x

IF 3.3 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Superlattices and Microstructures Pub Date : 2023-01-01 DOI:10.20517/microstructures.2022.46

Xueting Zhao, Kun Zhang, Ji Qi, Peng Liu, Zhao Zhang, Lin Qu, Zhidong Zhang, Bing Li

引用次数: 0

Abstract

A large driving pressure is required for barocaloric effects (BCEs) in intermetallics, usually above 100 MPa. Here, we report barocaloric effects in Mn3-xPt1+xalloys saturated at about 60 MPa, the lowest pressure reported in 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 dTt/dP up to 139 K/GPa. However, the maximum pressure-induced entropy changes are as small as 13.79 J kg-1 K-1, 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.

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Mn3-xPt1+x共线性到三角形反铁磁跃迁的低压驱动气压效应

金属间化合物的压热效应(BCEs)需要较大的驱动压力，通常在100mpa以上。在这里，我们报道了Mn3-xPt1+ x合金在60 MPa左右饱和时的气压效应，这是迄今为止金属间化合物中报道的最低压力。随着温度的降低，一阶相变由共线性反铁磁相向三角形反铁磁相转变。转变温度强烈依赖于x的组成，范围从331 K (x = 0.18)到384 K (x = 0.04)，并且对压力敏感，dTt/dP高达139 K/GPa。然而，由于晶格和磁熵变化相互抵消，压力诱导的最大熵变化很小，仅为13.79 J kg-1 K-1。驱动压力和总熵变化较小是由于特殊的磁几何挫败。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Superlattices and Microstructures 物理-物理：凝聚态物理

CiteScore

6.10

自引率

3.20%

发文量

审稿时长

2.8 months

期刊介绍： Micro and Nanostructures is a journal disseminating the science and technology of micro-structures and nano-structures in materials and their devices, including individual and collective use of semiconductors, metals and insulators for the exploitation of their unique properties. The journal hosts papers dealing with fundamental and applied experimental research as well as theoretical studies. Fields of interest, including emerging ones, cover: • Novel micro and nanostructures • Nanomaterials (nanowires, nanodots, 2D materials ) and devices • Synthetic heterostructures • Plasmonics • Micro and nano-defects in materials (semiconductor, metal and insulators) • Surfaces and interfaces of thin films In addition to Research Papers, the journal aims at publishing Topical Reviews providing insights into rapidly evolving or more mature fields. Written by leading researchers in their respective fields, those articles are commissioned by the Editorial Board. Formerly known as Superlattices and Microstructures, with a 2021 IF of 3.22 and 2021 CiteScore of 5.4