中国物理B ›› 2022, Vol. 31 ›› Issue (12): 127501-127501.doi: 10.1088/1674-1056/ac89d8
Hao Sun(孙浩)1,2, Junfeng Wang(王俊峰)2, Lu Tian(田路)2, Jianjian Gong(巩建建)1,2, Zhaojun Mo(莫兆军)2,†, Jun Shen(沈俊)3, and Baogen Shen(沈保根)1,‡
Hao Sun(孙浩)1,2, Junfeng Wang(王俊峰)2, Lu Tian(田路)2, Jianjian Gong(巩建建)1,2, Zhaojun Mo(莫兆军)2,†, Jun Shen(沈俊)3, and Baogen Shen(沈保根)1,‡
摘要: We investigate the structural, magnetic, and magnetocaloric effects (MCE) of Tm$_{1-x}$Er$_{x}$CuAl ($x = 0.25$, 0.5, and 0.75) compounds. The compounds undergo a second-order phase transition originating from the ferromagnetic to paramagnetic transition around 3.2 K, 5 K, and 6 K, respectively. The maximum magnetic entropy changes (${-\Delta S}_{\scriptscriptstyle{\rm M}}^{\rm max}$) of Tm$_{1-x}$Er$_{x}$CuAl ($x = 0.25$, 0.5, and 0.75) are 17.1 J$\cdot$kg$^{-1}\cdot$K$^{-1}$, 18.1 J$\cdot$kg$^{-1}\cdot$K$^{-1}$, and 17.5 J$\cdot$kg$^{-1}\cdot$K$^{-1}$ under the magnetic field in the range of 0-2 T, with the corresponding refrigerant capacity (RC) values of 131 J$\cdot$kg$^{-1}$, 136 J$\cdot$kg$^{-1}$, and 126 J$\cdot$kg$^{-1}$, respectively. The increase of ${-\Delta S}_{\scriptscriptstyle{\rm M}}^{\rm max}$ for Tm$_{0.5}$Er$_{0.5}$CuAl may be relevant to the change of magnetic moment distribution of Er and stress coming from element substitution. This work provides several compounds that can enrich the family of giant MCE materials in the cryogenic region.
中图分类号: (Magnetocaloric effect, magnetic cooling)