Giant low-field cryogenic magnetocaloric effect in polycrystalline LiErF4 compound  

作　　者：莫兆军 巩建建 谢慧财 张磊 付琪 高新强 李振兴 沈俊 Zhaojun Mo;Jianjian Gong;Huicai Xie;Lei Zhang;Qi Fu;Xinqiang Gao;Zhenxing Li;Jun Shen(Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou 341119,China;Key Laboratory of Cryogenics,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;school of Rare Earths,University of Science and Technology of China,Hefei 230026,China)

机构地区：[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

出　　处：《Chinese Physics B》2023年第2期468-472,共5页中国物理B（英文版）

基　　金：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);the Scientific Instrument Developing Project of Chinese Academy of Sciences (Grant No. YJKYYQ20200042)。

摘　　要：Antiferromagnetic LiErF4has 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 LiErF4compound 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 TNis 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 LiErF4compound an attractive candidate for the magnetic refrigeration at the ultra-low temperature.

关 键 词：LiErF4 magnetocaloric effect ultra-low temperature 

分 类 号：O469[理学—凝聚态物理]