Magnetotransport properties and magnetocaloric effect in La_0.67Ca_0.33Mn_{1鈭?span style='font-style: italic'>x}TM_xO₃ (TM=Cu, Zn) perovskite manganites

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• 作者：Quoc Thanh Phung^a ; Van Khai Vu^b ; An Bang Ngac^b ; Huy Sinh Nguyen^b ; Nam Nhat Hoang^a ; ^{namnhat@gmail.com}
• 关键词：Perovksite ; Manganate ; Magnetotransport ; Magnetocaloric effect
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2012
• 期刊代码：31_03048853
• 类别：ph
• 出版时间：August, 2012
• 卷：324
• 期：15
• 页码：2363-2367
• 文件大小：1054 K

摘要

The magnetic and transport properties of the perovskites La_0.67Ca_0.33Mn_1-xTM_xO₃ were found to be sufficiently changed with the substitution of Mn-sites by other 3d transition-metal cations (TM=Cu,Zn; x=0.15). The values of T_C, T_M鈭?em>I, and T_CMR were surveyed when Mn was replaced by Cu and Zn. The magnetic field induced resistivity and magnetic entropy change of these samples showed abrupt changes near T_C (194.2 and 201.5 K for Cu and Zn-doped case respectively) and attained the highest values among the doped cases (up to 20%Cu). The maximum values (obtained at H=4 kOe) of magnetoresistance ratio (CMR) were 27.8%, and 24.5%and of magnetic entropy change (鈭捨?em>S_M) were 3.9 and 3.2 J/kg K for Cu and Zn-doped, respectively.