Magnetism and cryogenic magnetocaloric effect of triangular-lattice LnOF(Ln=Gd,Dy,Ho,and Er) compounds  

作　　者：Jianjian Gong Lu Tian Lei Zhang Zhaojun Mo Yuanpeng Wang Jun Shen 

机构地区：[1]School of Rare Earths,University of Science and Technology of China,Hefei,230026,China [2]Key Laboratory of Rare Earths,Ganjiang Innovation Academy,Chinese Academy of Sciences,Ganzhou,34119,China [3]Department of Energy and Power Engineering,School of Mechanical Engineering,Beijing Institute of Technology,Beijing,00081,China

出　　处：《Journal of Rare Earths》2025年第1期98-104,I0004,共8页稀土学报(英文版)

基　　金：Project supported by the National Key Research and Development Program of China(2022YFB3505101);the National Science Foundation for Excellent Young Scholars(52222107);the National Science Foundation for Distinguished Young Scholars(51925605);the National Natural Science Foundation of China(52171195);the Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(E055B002)。

摘　　要：Frustrated lanthanide oxides with dense magnetic lattice and suppressed ordering temperature have potential applications in cryogenic magnetic refrigeration.Herein,the crystal structure,magnetic properties,magnetic phase transition(MPT)together with magnetocaloric effect(MCE)of LnOF(Ln=Gd,Dy,Ho,and Er)compounds were investigated.Crystallographic study shows that these compounds crystallize in the centrosymmetric space group R3m with an ideal triangular lattice.No long-range magnetic ordering is observed above 2 K for LnOF(Ln=Gd,Ho,and Er).However,DyOF compound undergoes an MPT from paramagnetic(PM)to antiferromagnetic(AFM)at the Neel temperature(TN≈4 K).Considerable reversible MCE is observed in these triangular-lattice compounds.Under the magnetic field change(μ0ΔH)of 0-2 T,the maximum values of magnetic entropy change(-ΔSMmax)of them are 6.1,9.4,12.7,and 14.1 J/(kg·K),respectively.Interestingly,the value of ErOF with Ising-like spin is 2.3 times that of GdOF,which provides an approach for exploring magnetic refrigerants with excellent low-field cryogenic magnetocaloric effect.

关 键 词：Geometric magnetic frustration Magnetic phase transition Magnetocaloric effect Magnetic refrigeration Rare earths 

分 类 号：TB64[一般工业技术—制冷工程]