Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF4 compound

doi:10.1088/1674-1056/ac65ef

中国物理B ›› 2023, Vol. 32 ›› Issue (2): 27503-027503.doi: 10.1088/1674-1056/ac65ef

Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF₄ compound

Zhaojun Mo(莫兆军)^1,†, Jianjian Gong(巩建建)^1,3, Huicai Xie(谢慧财)¹, Lei Zhang(张磊)¹, Qi Fu(付琪)¹, Xinqiang Gao(高新强)¹, Zhenxing Li(李振兴)¹, and Jun Shen(沈俊)^1,2,‡

1 Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China;
2 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Rare Earths, University of Science and Technology of China, Hefei 230026, China

收稿日期:2022-01-25 修回日期:2022-04-05 接受日期:2022-04-11 出版日期:2023-01-10 发布日期:2023-01-18
通讯作者: Zhaojun Mo, Jun Shen E-mail:mozhaojun@gia.cas.cn;jshen@mail.ipc.ac.cn
基金资助:
Project supported by the National Science Fund for Distinguished Young Scholars of China (Grant No. 51925605), the National Natural Science Foundation of China (Grant No. 52171195), the Key Research Program of the Chinese Academy of Sciences (Grant No. ZDRW-CN-2021-3), the Basic Frontier Scientific Research Program of Chinese Academy of Sciences From 0 to 1 Original Innovation Project (Grant No. ZDBS-LY-JSC017), and the Scientific Instrument Developing Project of Chinese Academy of Sciences (Grant No. YJKYYQ20200042).

Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF₄ compound

1 Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341119, China;
2 Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;
3 School of Rare Earths, University of Science and Technology of China, Hefei 230026, China

Received:2022-01-25 Revised:2022-04-05 Accepted:2022-04-11 Online:2023-01-10 Published:2023-01-18
Contact: Zhaojun Mo, Jun Shen E-mail:mozhaojun@gia.cas.cn;jshen@mail.ipc.ac.cn
Supported by:
Project supported by the National Science Fund for Distinguished Young Scholars of China (Grant No. 51925605), the National Natural Science Foundation of China (Grant No. 52171195), the Key Research Program of the Chinese Academy of Sciences (Grant No. ZDRW-CN-2021-3), the Basic Frontier Scientific Research Program of Chinese Academy of Sciences From 0 to 1 Original Innovation Project (Grant No. ZDBS-LY-JSC017), and the Scientific Instrument Developing Project of Chinese Academy of Sciences (Grant No. YJKYYQ20200042).

摘要/Abstract

摘要： Antiferromagnetic LiErF₄ has attracted extensive attention due to its dipolar interaction domination and quantum fluctuations action. In the present work, the crystal structure, cryogenic magnetic properties, and magnetocaloric effect (MCE) of polycrystalline LiErF₄ compound are investigated. Crystallographic study shows that the compound crystallizes in the tetragonal scheelite structure with I4₁/a space group. It exhibits an antiferromagnetic (AFM) phase transition around 0.4 K, accompanied by a giant cryogenic MCE. At 1.3 K, the maximum values of magnetic entropy changes are 24.3 J/kg·K, 33.1 J/kg·K, and 49.0 J/kg·K under the low magnetic field change of 0-0.6 T, 0-1 T, and 0-2 T, respectively. The giant MCE observed above Néel temperature T_N is probably due to the strong quantum fluctuations, which cause a large ratio of the unreleased magnetic entropy existing above the phase transition temperature. The outstanding low-field MCE below 2 K makes the LiErF₄ compound an attractive candidate for the magnetic refrigeration at the ultra-low temperature.

关键词: LiErF₄, magnetocaloric effect, ultra-low temperature

Abstract: Antiferromagnetic LiErF₄ has attracted extensive attention due to its dipolar interaction domination and quantum fluctuations action. In the present work, the crystal structure, cryogenic magnetic properties, and magnetocaloric effect (MCE) of polycrystalline LiErF₄ compound are investigated. Crystallographic study shows that the compound crystallizes in the tetragonal scheelite structure with I4₁/a space group. It exhibits an antiferromagnetic (AFM) phase transition around 0.4 K, accompanied by a giant cryogenic MCE. At 1.3 K, the maximum values of magnetic entropy changes are 24.3 J/kg·K, 33.1 J/kg·K, and 49.0 J/kg·K under the low magnetic field change of 0-0.6 T, 0-1 T, and 0-2 T, respectively. The giant MCE observed above Néel temperature T_N is probably due to the strong quantum fluctuations, which cause a large ratio of the unreleased magnetic entropy existing above the phase transition temperature. The outstanding low-field MCE below 2 K makes the LiErF₄ compound an attractive candidate for the magnetic refrigeration at the ultra-low temperature.

Key words: LiErF₄, magnetocaloric effect, ultra-low temperature

中图分类号: (Magnetocaloric effect, magnetic cooling)

75.30.Sg

75.47.Pq (Other materials)

Zhaojun Mo(莫兆军), Jianjian Gong(巩建建), Huicai Xie(谢慧财), Lei Zhang(张磊), Qi Fu(付琪), Xinqiang Gao(高新强), Zhenxing Li(李振兴), and Jun Shen(沈俊). Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF₄ compound[J]. 中国物理B, 2023, 32(2): 27503-027503.

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Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF₄ compound

Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF₄ compound

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