Chin. Phys. B, 2021, Vol. 30(7): 077501    DOI: 10.1088/1674-1056/abf916
 CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next

# Magnetism and giant magnetocaloric effect in rare-earth-based compounds R3BWO9 (R = Gd, Dy, Ho)

Lu-Ling Li(李炉领)1, Xiao-Yu Yue(岳小宇)1,†, Wen-Jing Zhang(张文静)1, Hu Bao(鲍虎)3, Dan-Dan Wu(吴丹丹)1, Hui Liang(梁慧)1, Yi-Yan Wang(王义炎)1, Yan Sun(孙燕)1, Qiu-Ju Li(李秋菊)3, and Xue-Feng Sun(孙学峰)2,1,‡
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
Abstract  The magnetism and magnetocaloric effect (MCE) of rare-earth-based tungstate compounds $R_{3}$BWO$_{9 }$ ($R = {\rm Gd}$, 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$\cdot$K at 2 K for Gd$_{3}$BWO$_{9}$, 28.5 J/kg$\cdot$K at 6 K for Dy$_{3}$BWO$_{9}$, and 29.76 J/kg$\cdot$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 ($-\Delta S_{M}^{\max}$) and adiabatic temperature change ($- \Delta T_{\rm ad}^{\max}$) are 36.75 J/kg$\cdot$K and 5.56 K for a low field change of 0-3 T, indicating a promising application for low temperature magnetic refrigeration.
Keywords:  magnetocaloric effect      short-range spin correlation
Received:  25 March 2021      Revised:  13 April 2021      Accepted manuscript online:  19 April 2021
 PACS: 75.30.Sg (Magnetocaloric effect, magnetic cooling) 75.40.-s (Critical-point effects, specific heats, short-range order)
Fund: Project supported by 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), and the Natural Science Foundation of Anhui Province, China (Grant No. 1908085MA09).
Corresponding Authors:  Xiao-Yu Yue, Xue-Feng Sun     E-mail:  xyyue@ahu.edu.cn;xfsun@ustc.edu.cn