A comparative study of the magnetocaloric effect in Gd3Co and Gd3Ni |
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| Institution: | 1. Department of Physics, I.I.T. Bombay, Mumbai 400076, India;2. Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, India;1. National Institute for Materials Science, Tsukuba 305-0003, Japan;2. Japan Atomic Energy Agency, Naka 311-0193, Japan;3. Osaka Gas Co., Ltd., Osaka 541-0046, Japan;4. Kanazawa University, Kanazawa 920-1192, Japan;1. Institute for Superconducting and Electronic Materials, Innovation Campus, University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia;2. Neutron Science Platform, Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China;3. Institute of Physics, Chinese Academy of Sciences, Haidian, Beijing 100190, China;4. College of Physics, Jilin University, Changchun 130012, China;5. School of Physical, Environmental and Mathematical Sciences, The University of New South Wales, Canberra, ACT 2600, Australia;6. Australian Centre for Neutron Scattering, The Australian Nuclear Science and Technology Organisation, Sydney, NSW 2234, Australia;7. Australian Synchrotron ANSTO, 800 Blackburn Rd, Clayton, Vic 3168, Australia;1. Department of Physics, Indian Institute of Technology Madras, Chennai 600 036, India;2. Defence Metallurgical Research Laboratory, Hyderabad 500 058, India;3. Departamento de F’ısica Teorica e Experimental, Universidade Federal do Rio Grande do Norte, Natal 59072-970, Brazil;1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China;2. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, PR China;3. NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, 20899, USA |
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| Abstract: | Magnetic and magnetocaloric properties of polycrystalline samples of Gd3Co and Gd3Ni have been studied. Both these compounds are antiferromagnets and undergo metamagnetic transitions in the antiferromagnetic phase. The Neel temperatures are found to be 128 and 99 K, respectively for Gd3Co and Gd3Ni. Though both these compounds have the same crystal structure, their magnetic structures seem to be different. It is found that Gd3Ni possesses larger magnetic anisotropy compared to Gd3Co. The maximum values of isothermal magnetic entropy change are 11 and 18.5 J Kg−1 K−1 for Gd3Co and Gd3Ni respectively, while their refrigerant capacities are 2.6 J cm−3 for both of them. Magnetic entropy change in the paramagnetic region shows a quadratic dependence on the magnetic field in the case of Gd3Ni, indicating the presence of spin fluctuations above the Neel temperature. |
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