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

Author： Qian-Heng Du Guo-Fu Chen Wen-Yun Yang Mu-Xin Hua Hong-Lin Du Chang-Sheng Wang Shun-Quan Liu Jing-Zhi Hang Dong Zhou Yan Zhang Jin-Bo Yan

Publisher： IOP Publishing

E-ISSN： 1741-4199|24|6|67502-67506

ISSN： 1674-1056

Source： Chinese Physics B, Vol.24, Iss.6, 2015-06, pp. : 67502-67506

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Abstract

The structure and magnetic properties of MnCoSi_{1− x} P_x (x = 0.05–0.50) 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.