Magnetism and giant magnetocaloric effect in rare-earth-based compounds R_(3)BWO_9(R=Gd,Dy,Ho)  

作　　者：Lu-Ling Li Xiao-Yu Yue Wen-Jing Zhang Hu Bao Dan-Dan Wu Hui Liang Yi-Yan Wang Yan Sun Qiu-Ju Li Xue-Feng Sun 李炉领;岳小宇;张文静;鲍虎;吴丹丹;梁慧;王义炎;孙燕;李秋菊;孙学峰(Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Hefei National Laboratory for Physical Sciences at Microscale,Department of Physics,and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS),University of Science and Technology of China,Hefei 230026,China;School of Physics&Material Science,Anhui University,Hefei 230039,China)

机构地区：[1]Institute of Physical Science and Information Technology,Anhui University,Hefei 230601,China [2]Hefei National Laboratory for Physical Sciences at Microscale,Department of Physics,and Key Laboratory of Strongly-Coupled Quantum Matter Physics(CAS),University of Science and Technology of China,Hefei 230026,China [3]School of Physics&Material Science,Anhui University,Hefei 230039,China

出　　处：《Chinese Physics B》2021年第7期533-537,共5页中国物理B（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.U1832209,11874336,and 11904003);the National Basic Research Program of China(Grant No.2016YFA0300103);the Innovative Program of Hefei Science Center CAS(Grant No.2019HSC-CIP001);the Natural Science Foundation of Anhui Province,China(Grant No.1908085MA09)。

摘　　要：The magnetism and magnetocaloric effect(MCE)of rare-earth-based tungstate compounds R_(3)BWO_9(R=Gd,Dy,Ho)have been studied by magnetic susceptibility,isothermal magnetization,and specific heat measurements.No obvious long-range magnetic ordering can be found down to 2 K.The Curie-Weiss fitting and magnetic susceptibilities under different applied fields reveal the existence of weak short-range antiferromagnetic couplings at low temperature in these systems.The calculations of isothermal magnetization exhibit a giant MCE with the maximum changes of magnetic entropy being 54.80 J/kg-K at 2 K for Gd_(3)BWO_9,28.5 J/kg-K at 6 K for Dy_(3)BWO_(9),and 29.76 J/kg-K at 4 K for Ho_(3)BWO_9,respectively,under a field change of 0-7 T.Especially for Gd_(3)BWO_9,the maximum value of magnetic entropy change(-ΔS_M^(max))and adiabatic temperature change(-ΔT_(ad)^(max))are 36.75 J/kg·K and 5.56 K for a low field change of 0-3 T,indicating a promising application for low temperature magnetic refrigeration.

关 键 词：magnetocaloric effect short-range spin correlation 

分 类 号：O469[理学—凝聚态物理] TB34[理学—电子物理学]