Giant magnetic refrigerant capacity in Ho3Al2 compound |
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| Authors: | H Zhang ZY Xu XQ Zheng J Shen FX Hua JR Sun BG Shen |
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| Affiliation: | 1. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, PR China;2. Key laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China;1. Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA;2. Lebedev Physical Institute, Leninsky Prospekt 53, 119991 Moscow, Russia;1. Department of Physics, Capital Normal University, Beijing 100048, People''s Republic of China;2. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People''s Republic of China;3. Beijing Institute of Aerospace Testing Technology, China Aerospace Science and Technology Corporation, Beijing 100074, People''s Republic of China;4. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, People''s Republic of China;1. Department of Physics, Capital Normal University, Beijing 100048, People''s Republic of China;2. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People''s Republic of China;3. Beijing Institute of Aerospace Testing Technology, China Aerospace Science and Technology Corporation, Beijing 100074, People''s Republic of China;1. State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China;2. Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Straße 10, D-48149, Münster, Germany;1. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan 030024, China;2. School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology, Chongqing 401331, China;3. Department of Physics, Capital Normal University, Beijing 100048, China;4. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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| Abstract: | Magnetic properties and magnetocaloric effects (MCEs) of the intermetallic Ho3Al2 compound are investigated by magnetization and heat capacity measurements. Two successive magnetic transitions, a spin-reorientation (SR) transition at TSR=31 K followed by a ferromagnetic (FM) to paramagnetic (PM) transition at TC=40 K, are observed. Both magnetic transitions contribute to the MCE and result in a large magnetic entropy change (ΔSM) in a wide temperature range. The maximum values of ?ΔSM and adiabatic temperature change (ΔTad) reach 18.7 J/kg K and 4.8 K for the field changes of 0–5 T, respectively. In particular, a giant value of refrigerant capacity (RC) is estimated to be 704 J/kg for a field change of 5 T, which is much higher than those of many potential refrigerant materials with similar transition temperatures. |
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