Magnetic properties and magnetocaloric effect of the Cr-based spinel sulfides Co_(1-x)Cu_xCr_2S_4 |
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| Institution: | 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 |
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| Abstract: | 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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| Keywords: | chalcospinels magnetocaloric effect magnetism crystal structure |
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