Magnetic Properties of Al-Doped Na_(0.7)Co_(1-x)Al_xO_2  

作　　者：Yong Zhang Zhi-Huan Wu Cui-Hua Cheng Yong Zhao 

机构地区：[1]The authors are With Key Laboratory of Magnetic Levitation and Maglev Trains （Ministry of Education of China）, Superconductivity R＆D Center, Southwest Jiaotong University, Chengdu, 610031, China [2]School of Materials Science and Engineering, University of New South Wales, Sydney 2052, NSW, Australia

出　　处：《Journal of Electronic Science and Technology of China》2008年第2期162-165,共4页中国电子科技（英文版）

基　　金：This work was supported by the National Science Foundation of China under Grant No. 50372052, 50430137, 50588201; the National Basic Research Program of China (973 program), under Grant No. 2007CB616906);the Program for Changjiang Scholars and Innovative Research Team in University;Australian Research Council under Grant No. DP0559872, DP0881739.

摘　　要：Single phase polycrystalline samples Na0.7Co1-xAlxO2 （x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 030） were prepared by solid state reaction. The magnetic properties from 5 K to 300 K have been studied by dc and ac magnetic susceptibility measurements. Samples with lower doping quantity （x = 0, 0.05, 0.10） showed paramagnetic behaviors, but those with higher doping quantity （x=0.20, 0.25, 0.30）showed spin-glass behaviors with a freezing temperature （Tf） of about 13 K.Single phase polycrystalline samples Na0.7Co1-xAlxO2 （x = 0, 0.05, 0.10, 0.15, 0.20, 0.25, 030） were prepared by solid state reaction. The magnetic properties from 5 K to 300 K have been studied by dc and ac magnetic susceptibility measurements. Samples with lower doping quantity （x = 0, 0.05, 0.10） showed paramagnetic behaviors, but those with higher doping quantity （x=0.20, 0.25, 0.30）showed spin-glass behaviors with a freezing temperature （Tf） of about 13 K.

关 键 词：ac susceptibility Al-doped Na0.7CoO2 field-cooled magnetization spin-glass state zero-fieldcooled magnetization 

分 类 号：O441[理学—电磁学]