Influences of P doping on magnetic phase transition and structure in MnCoSi ribbon

• Published in: Chinese physics B 2015-06, Vol.24 (6), p.551-555
• Main Author: 杜乾衡 陈国富 杨文云 毕慕欣 杜红林 王常生 刘顺荃 韩景智 周栋 张焱 杨金波
• Format: Article
• Language: English
• Subjects: Coupling (molecular); Crystal structure; Ferromagnetism; Lattice parameters; Magnetic properties; Magnetic transitions; Modulation; Phase transformations; P掺杂; 单调增加; 带状; 晶体结构; 晶格参数; 磁相变; 铁磁态; 高温度
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/24/6/067502

The structure and magnetic properties of MnCoSil_xPx （x = 0.054）.50） are systematically investigated. With P content increasing, the lattice parameter a increases monotonically while both b and c decrease. At the same time, the temperature of metamagnetic transition from a low-temperature non-collinear ferromagnetic state to a high-temperature ferromagnetic state decreases and a new magnetic transition from a higher-magnetization ferromagnetic state to a lower- magnetization ferromagnetic state is observed in each of these compounds for the first time. This is explained by the changes of crystal structure and distance between Mn and Si atoms with the increase of temperature according to the high- temperature XRD result. The metamagnetic transition is found to be a second-order magnetic transition accompanied by a low inversed magnetocaloric effect （1.0 J·kg-1 ·K- 1 at 5 T） with a large temperature span （190 K at 5 T） compared with the scenario of MnCoSi. The changes in the order of metamagnetic transition and structure make P-doped MoCoSi compounds good candidates for the study of magnetoelastic coupling and the modulation of magnetic phase transition.