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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 |
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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 TN 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.
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Received: 25 January 2022
Revised: 05 April 2022
Accepted manuscript online: 11 April 2022
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PACS:
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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75.47.Pq
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(Other materials)
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| Fund: 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). |
Corresponding Authors:
Zhaojun Mo, Jun Shen
E-mail: mozhaojun@gia.cas.cn;jshen@mail.ipc.ac.cn
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Cite this article:
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 2023 Chin. Phys. B 32 027503
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