Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi0.77Fe0.23Ge Alloy

• 作者: Enke Liu Guangheng Wu Jianlei Shen Qingqi Zeng Wenhong Wang Xixiang Zhang Xuekui Xi
• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2020,（7）
• 所属期刊栏目: CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES
• 页码范围: 47-50
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/37/7/076101

摘要

The hydrostatic pressure is expected to be an effective knob to tune the magnetostructural phase transitions of hexagonal MM'X alloys (M and M'denote transition metals and X represents main group elements).We perform magnetization measurements under hydrostatic pressure on an MM'X martensitic MnNi0.77Fe0.23Ge alloy.The magnetostructural transition temperature can be efficiently tuned to lower temperatures by applying moderate pressures,with a giant shift rate of-151K/GPa.A temperature span of 30 K is obtained under the pressure,within which a large magnetic entropy change of-23J·kg-1K-1 in a field change of 5T is induced by the mechanical energy gain due to the large volume change.Meanwhile,a decoupling of structural and magnetic transitions is observed at low temperatures when the martensitic transition temperature is lower than the Curie temperature.These results show a multi-parameter tunable caloric effect that benefits the solid-state cooling.

作者信息

序号	姓名	单位	发文数	被引次数	H指数	G指数
1	Xixiang Zhang	中国科学院物理研究所	2	0	0.0	0.0
2	Qingqi Zeng	中国科学院物理研究所	1	0	0.0	0.0
3	Jianlei Shen	中国科学院物理研究所	1	0	0.0	0.0
4	Enke Liu	中国科学院物理研究所	1	0	0.0	0.0
5	Xuekui Xi	中国科学院物理研究所	1	0	0.0	0.0
6	Wenhong Wang	中国科学院物理研究所	1	0	0.0	0.0
7	Guangheng Wu	中国科学院物理研究所	1	0	0.0	0.0