| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Magnetic and Magnetocaloric Properties of Polycrystalline and Oriented Mn$_{2-\delta}$Sn |
| Kun Li1,2, Fanggui Wang1,2, Youfang Lai1,2, Mingzhu Xue1,2, Xin Li1,2, Jinbo Yang1,2,3, Changsheng Wang1,2, Jingzhi Han1,2, Shunquan Liu1,2, Wenyun Yang1,2, Yingchang Yang1,2, Honglin Du1,2** |
1School of Physics, Peking University, Beijing 100871
2Beijing Key Laboratory for Magnetoelectric Materials and Devices, Beijing 100871
3Collaborative Innovation Center of Quantum Matter, Beijing 100871
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| Cite this article: |
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Kun Li, Fanggui Wang, Youfang Lai et al 2019 Chin. Phys. Lett. 36 097502 |
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Abstract Mn-based Heusler alloys have attracted significant research attention as half-metallic materials because of their giant magnetocrystalline anisotropy and magnetocaloric properties. We investigate the crystal structure and magnetic properties of polycrystalline, [101]-oriented, and [100]-oriented Mn$_{2-\delta}$Sn prepared separately by arc melting, the Bridgeman method, and the flux method. All of these compounds crystallize in a Ni$_{2}$In-type structure. In the Mn$_{2-\delta}$Sn lattice, Mn atoms occupy all of the 2$a$ and a fraction of the 2$d$ sites. Site disorder exists between Mn and Sn atoms in the 2$c$ sites. In addition, these compounds undergo a re-entrant spin-glass-like transition at low temperatures, which is caused by frustration and randomness within the spin system. The magnetic properties of these systems depend on the crystal directions, which means that the magnetic interactions differ significantly along different directions. Furthermore, these materials exhibit a giant magnetocaloric effect near the Curie temperature. The largest value of maximum of magnetic entropy change ($-\Delta S_{\rm M})$ occurs perpendicular to the [100] direction. Specifically, at 252 K, maximum $-\Delta S_{\rm M}$ is 2.91 and 3.64 J$\cdot$kg$^{-1}$K$^{-1}$ for a magnetic field of 5 and 7 T, respectively. The working temperature span over 80 K and the relative cooling power reaches 302 J/kg for a magnetic field of 7 T, which makes the Mn$_{2-\delta}$Sn compound a promising candidate for a magnetic refrigerator.
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Received: 05 May 2019
Published: 23 August 2019
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| PACS: |
75.30.Gw
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(Magnetic anisotropy)
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75.30.Sg
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(Magnetocaloric effect, magnetic cooling)
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| Fund: Supported by the National Natural Science Foundation of China under Grant Nos 11675006, 51731001 and 11805006, and the National Key Research and Development Program of China under Grant Nos 2017YFA0206303, 2016YFB0700901 and 2017YFA0403701. |
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