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Large magnetocaloric effect in metamagnetic HoPdAl

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Abstract

Magnetic properties and magnetocaloric effects (MCEs) of the HoPdAl compounds with the hexagonal ZrNiAl-type and the orthorhombic TiNiSi-type structures are investigated. Both the compounds are found to be antiferromagnet with the Néel temperature T N =12 and 10 K, respectively. A field-induced metamagnetic transition from antiferromagnetic (AFM) state to ferromagnetic (FM) state is observed below T N . For the hexagonal HoPdAl, a small magnetic field can induce an FM-like state due to a weak AFM coupling, which leads to a high saturation magnetization and gives rise to a large MCE around T N . The maximal value of magnetic entropy change (ΔS M ) is −20.6 J/kg K with a refrigerant capacity (RC) value of 386 J/kg for a field change of 0–5 T. For the orthorhombic HoPdAl, the critical field required for metamagnetic transition is estimated to be about 1.5 T, showing a strong AFM coupling. However, the maximal ΔS M value is still −13.7 J/kg K around T N for a field change of 0–5 T. The large reversible ΔS M and considerable RC suggest that HoPdAl may be an appropriate candidate for magnetic refrigerant in a low temperature range.

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  1. State Key Laboratory for Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    ZhiYi Xu & BaoGen Shen

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  1. ZhiYi Xu
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  2. BaoGen Shen
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Correspondence to BaoGen Shen.

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Xu, Z., Shen, B. Large magnetocaloric effect in metamagnetic HoPdAl. Sci. China Technol. Sci. 55, 445–450 (2012). https://doi.org/10.1007/s11431-011-4681-9

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