Magnetocaloric effect in HoMn2Si2 compound with multiple magnetic phase transitions |
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| Affiliation: | 1. Institute for Frontier Materials, Deakin University, Geelong, VIC, 3216, Australia;2. Institute for Superconducting & Electronic Materials, University of Wollongong, New South Wales, 2522, Australia;1. Department of Applied Material Science and Materials Engineering, Lviv Polytechnic National University, Ustyyanovycha Str. 5, 79013 Lviv, Ukraine;2. Inorganic Chemistry Department, Ivan Franko Lviv National University, Kyryla and Mefodiya str. 6, 79005 Lviv, Ukraine;3. Institute of Materials Chemistry and Research, University of Vienna, Währingerstrasse 42, A-1090 Wien, Austria;1. Department of Physics, Faculty of Science, Al Azhar University, Nasr City 11884, Cairo, Egypt;2. Department of Physics, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia;3. Department of Physics, Faculty of Science (Girl’s Branch), Al Azhar University, Nasr City, Cairo, Egypt;1. Dpto. Física de la Materia Condensada, ICMSE-CSIC, Universidad de Sevilla, P.O. Box 1065, 41080 Sevilla, Spain;2. Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Wołoska st., 02-507 Warsaw, Poland;3. Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11 Bratislava 45, Slovak Republic;1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;2. University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan;3. Hokkaido University, N20 W10, Kita-ku, Sapporo, Hokkaido 001-0020, Japan;4. Kyoto University of Advanced Science (KUAS), Ukyo-ku, Kyoto 615-8577, Japan;5. Instituto de Fisica, Universidade Federal do Rio de Janeiro, CxP 68528, 21945-972 Rio de Janeiro, Brazil |
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| Abstract: | The structural, magnetic and magnetocaloric properties of the polycrystalline compound HoMn2Si2 have been studied. The temperature variation of magnetization and heat capacity show that below room temperature the compound under goes multiple magnetic transitions, at about 80, 15 and 3.5 K respectively. Moreover, the presence of the interesting thermomagnetic irreversibility in HoMn2Si2 is detected in the magnetization versus temperature plot, which can be ascribed to the narrow domain wall pinning effect. A broad and asymmetric peak is observed for the MCE response which might suggest the underlying first-order nature of the transition and/or the spin fluctuations of the Mn subsystem. The density of states N(EF) at the Fermi level and the Debye temperature have been determined and analyzed. Large magnetocaloric effect (ΔSM = −9 J/kg-K for a field change of 5 T around 9 K) suggest that this material is suitable for the low temperature magnetic refrigeration. |
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| Keywords: | Intermetallics Magnetocaloric effect Magnetic phase transition |
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