采用固相反应法制备双层钙钛矿(La1-xEu)4/3Sr5/3 Mn2O7(x=0.0,0.1,0.2)多晶样品,并研究其结构,磁性和电输运性质.XRD结果表明,三个样品均为良好的单相结构.样品(La1-xEux)4/3Sr5/3 Mn2O7(x=0.0,0.1,0.2)在低温区的ZFC曲线和FC曲线出现明显分歧,表现出团簇自旋玻璃的特征.对电阻率-温度曲线的拟合结果表明,三个样品在高温区的导电机制不同.我们认为这是由于半径较小的Eu3+离子替代La3+离子使La位离子平均半径减小,引起晶格发生畸变,同时,Eu3+离子倾向于占据钙钛矿层与岩盐层之间的R-位,使La3+,Sr3,Eu3+离子在掺Eu样品中的分布更加有序导致的.
Polycrystalline samples of (La1-xEux) 4/3Sr5/3Mn2O7 (x =0.0,0.1,0.2) with perovskite-related structure were prepared by conventional solid state reaction method,and their structural,magnetic and electrical transport properties were studied.XRD results show that,all three samples are in bilayered RP phase.With finitely doped Eu,the ZFC and FC curves in the low temperature region exhibit significant differences,suggesting a characteristics of clustered spin glass.For resistivity-temperature curve fitting results show that the three samples in the conductive mechanism of high temperature section is different.We think that this is due to the smaller radius of Eu3 + ions make La a substitute La3 + ions mean radius decreases,and cause the lattice distortion,at the same time,the smaller the Eu3 + ions occupy the rock salt layer between the layers of R-site make La3 +,Sr3+,Eu3 +ions in the samples (La1-x Eux) 4/3 Sr5/3 Mn2O7 (x =0.1,0.2) the distribution more orderly.
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