Magnetic properties and magnetocaloric effect of the Cr-based spinel sulfides Co1−xCuxCr2S4

Magnetic properties and magnetocaloric effect of the Cr-based spinel sulfides Co_1−xCu_xCr₂S₄

Zheng Xiao-Chao^{1, 2}, Li Xi-Yang², He Lun-Hua^{2, 3}, Zhang Shao-Ying^{2, 3}, Tang Ming-Hua^{4, ‡}, Wang Fang-Wei^{2, 3, †}

(color online) Powder x-ray diffraction (XRD) patterns of Co_1−xCu_xCr₂S₄ (x = 0, 0.2, 0.4, 0.6, 0.8) measured with a Cu-Kα source on a Bruker D8 instrument at RT. Bottom panel is the Rietveld refinement XRD pattern of the parent CoCr₂S₄ sample. Observed intensity and calculated intensity are represented by black cross signs and red solid line. The magenta bar represents the Bragg peaks position and the blue curve at the bottom represents the residual (observed intensity minus calculated intensity difference). The green line is the background used in the refinement. The inset shows the spinel-type crystal structure of ACr₂S₄ (A: cyan, Cr: red, S: yellow).