Effects of Fe2+ substitution on magnetic and dielectric properties of CdCr2S4
Yan Li-Qin(闫丽琴)a)†, Sun Yang(孙阳) a), He Lun-Hua(何伦华)a), Wang Fang-Wei(王芳卫)a), and Shen Jun(沈俊) b)
aState Key Laboratory of Magnetism, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China; bKey Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China
Abstract The magnetic and dielectric properties of polycrystalline Cd1 - xFexCr2S4 (0 ≤ x ≤ 0.9) are investigated. Upon substitution of Cd by Fe, the Curie temperature (TC) is increased while the saturation magnetization is decreased. A low doping level of Fe increases the permittivity, while a high doping level decreases the permittivity, which is explained by the internal barrier layer capacitor model. Kinks are observed in the temperature-dependent permittivity and loss tangent near TC for the samples with x= 0.5, 0.7, 0.9, implying the existence of the magnetodielectric effect. Furthermore, with the increase of Fe content, a decrease of anomaly deviation rate induced by internal molecular field is revealed in the permittivity, while an increase is observed for the loss tangent.
(Intrinsic properties of magnetically ordered materials)
Cite this article:
Yan Li-Qin(闫丽琴), Sun Yang(孙阳), He Lun-Hua(何伦华), Wang Fang-Wei(王芳卫), and Shen Jun(沈俊) Effects of Fe2+ substitution on magnetic and dielectric properties of CdCr2S4 2011 Chin. Phys. B 20 097503
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