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Chin. Phys. B, 2015, Vol. 24(6): 067502    DOI: 10.1088/1674-1056/24/6/067502
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

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

Du Qian-Henga, Chen Guo-Fua, Yang Wen-Yuna, Hua Mu-Xina, Du Hong-Lina, Wang Chang-Shenga, Liu Shun-Quana, Han Jing-Zhia, Zhou Dongb, Zhang Yana, Yang Jin-Boa
a School of Physics, Peking University, Beijing 100871, China;
b Central Iron and Steel Research Institute, Beijing 100081, China
Abstract  The structure and magnetic properties of MnCoSi1-xPx (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.
Keywords:  metamagnetic transition      magnetoelastic coupling      magnetocaloric effect     
Received:  15 December 2014      Published:  05 June 2015
PACS:  75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))  
  75.30.Sg (Magnetocaloric effect, magnetic cooling)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11275013), the Fund from the National Physics Laboratory, China Academy of Engineering Physics (Grant No. 2013DB01), and the National Key Basic Research Program of China (Grant No. 2010CB833104).
Corresponding Authors:  Du Hong-Lin     E-mail:  duhonglin@pku.edu.cn
About author:  75.30.Kz; 75.30.Sg

Cite this article: 

Du Qian-Heng, Chen Guo-Fu, Yang Wen-Yun, Hua Mu-Xin, Du Hong-Lin, Wang Chang-Sheng, Liu Shun-Quan, Han Jing-Zhi, Zhou Dong, Zhang Yan, Yang Jin-Bo Influences of P doping on magnetic phase transition and structure in MnCoSi ribbon 2015 Chin. Phys. B 24 067502

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