| SPECIAL TOPIC — Multiferroicity and multicaloric effects |
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Enhanced low-field magnetocaloric effect induced by Co doping in RCu2-xCox (R = Er, Ho) compounds for liquid hydrogen |
| Lu Tian(田路)1, Zhaojun Mo(莫兆军)1,†, Xuanyu Qiao(乔轩雨)1, Chenyang Ma(马辰洋)2, and Guodong Liu(刘国栋)2 |
1 Key Laboratory of Rare Earths, Ganjiang Innovation Academy, Chinese Academy of Sciences, Ganzhou 341000, China;
2 School of Science, Hebei University of Technology, Tianjin 300130, China |
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Abstract Hydrogen, as a clean energy carrier, requires liquefaction at 20-77 K, a process that is energy-intensive and traditionally dependent on conventional refrigeration methods. Magnetocaloric refrigeration offers a promising alternative, especially when using permanent magnets as the magnetic field source, which can significantly simplify system design and reduce operational costs. Designing magnetocaloric materials with magnetic ordering temperatures within the hydrogen liquefaction range and exhibiting superior magnetocaloric effects under low magnetic fields is essential for advancing sustainable energy technologies. This study presents an in-depth investigation of the enhanced low-field magnetocaloric effect (MCE) in $R$Cu$_{2-x}$Co$_{x}$ ($R = {\rm rare}$-earth) compounds. The results indicate that Co doping significantly modifies orbital hybridization and magnetic properties, which in turn improves the MCE under low fields. Experimental data confirm that Co-doped compounds show MCE performance at low fields. For instance, under a varying magnetic field of 0-2 T, the volumetric magnetic entropy change of the ErCu$_{1.75}$Co$_{0.25}$ compound reaches 0.12 J$\cdot$cm$^{-3}\cdot$K$^{-1}$. First-principles calculations provide further insights into the electronic density of states and magnetic exchange interactions, clarifying the mechanisms behind the enhanced MCE.
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Received: 21 November 2025
Revised: 06 January 2026
Accepted manuscript online: 09 January 2026
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PACS:
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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75.47.Pq
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(Other materials)
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| Fund: This work was supported by the Light of the Soviet Area Innovation Leading Talent Program (Grant No. E23HB00101), the National Natural Science Foundation of China (Grant No. 52501262), and the Key Laboratory of Rare Earths, Chinese Academy of Sciences. |
Corresponding Authors:
Zhaojun Mo
E-mail: mozhaojun@gia.cas.cn
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Cite this article:
Lu Tian(田路), Zhaojun Mo(莫兆军), Xuanyu Qiao(乔轩雨), Chenyang Ma(马辰洋), and Guodong Liu(刘国栋) Enhanced low-field magnetocaloric effect induced by Co doping in RCu2-xCox (R = Er, Ho) compounds for liquid hydrogen 2026 Chin. Phys. B 35 077505
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