| Title | Magnetic and Magnetocaloric Properties of Polycrystalline and Oriented Mn2-delta Sn |
| Authors | Li, Kun Wang, Fanggui Lai, Youfang Xue, Mingzhu Li, Xin Yang, Jinbo Wang, Changsheng Han, Jingzhi Liu, Shunquan Yang, Wenyun Yang, Yingchang Du, Honglin |
| Affiliation | Peking Univ, Sch Phys, Beijing 100871, Peoples R China Beijing Key Lab Magnetoelect Mat & Devices, Beijing 100871, Peoples R China Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China |
| Issue Date | 2019 |
| Publisher | CHINESE PHYSICS LETTERS |
| 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 Mn2-delta Sn prepared separately by arc melting, the Bridgeman method, and the flux method. All of these compounds crystallize in a Ni2In-type structure. In the Mn2-delta Sn lattice, Mn atoms occupy all of the 2a and a fraction of the 2d sites. Site disorder exists between Mn and Sn atoms in the 2c 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-M) occurs perpendicular to the [100] direction. Specifically, at 252 K, maximum -Delta S-M is 2.91 and 3.64 J.kg(-1) K-1 for a magnetic field of 5 and 7 T, respectively. The working temperature span over 80K and the relative cooling power reaches 302 J/kg for a magnetic field of 7T, which makes the Mn2-delta Sn compound a promising candidate for a magnetic refrigerator. |
| URI | http://hdl.handle.net/20.500.11897/545371 |
| ISSN | 0256-307X |
| DOI | 10.1088/0256-307X/36/9/097502 |
| Indexed | SCI(E) EI |
| Appears in Collections: | 物理学院 |
