1 School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, China;
2 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
3 Dongguan Branch, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan 523803, China;
4 Key Laboratory of Key Film Materials and Application for Equipments(Hunan Province), School of Material Sciences and Engineering, Xiangtan University, Xiangtan 411105, China
Crystallographic structure, magnetic properties, and magnetic entropy change of the Cr-based spinel sulfides Co1-xCuxCr2S4 (x=0-0.8) have been investigated. All these compounds crystallize into the cubic spinel structure, the Cu substitution shrinks linearly the lattice constant at a ratio of 0.0223 Å per Cu atom in the unit cell, and enhances linearly the Curie temperature and the spontaneous magnetization at the rates of 18 K and 0.33 μB/f.u. per Cu atom in the unit cell, respectively. All these compounds show a typical behavior of second order magnetic transition, and a room temperature magnetic entropy change of 2.57 J/kg·K is achieved for Co0.4Cu0.6Cr2S4.
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