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中文摘要：
通过固相反应烧结法成功制备了层状钙钛矿La1.3Sr1.7Mn2-xCuxO7多晶，主要研究了其磁电特性。结果表明，样品为Sr3Ti2O7型钙钛矿结构,随着温度的降低，其磁性经历了一个很复杂的转变过程。当x=0时，在T=231K出现二维短程铁磁有序，在Tc=114K出现三维k程铁磁有序，在Tn=56K出现倾斜的反铁磁转变。当x=0．05时，Cu替代使得T＊，Tc、和Tn减小,其电特性表明，La1.3Sr1.7Mn2-xCuxO7多品呈现出双峰现象，这是由于钙钛矿结构锰氧化物共生现象造成的,虽然5％Cu替代，降低了金属-绝缘体转变温度，但是却增强了磁电阻效应。
英文摘要：
Magnetic and electrical properties of polycrystalline La1.3Sr1.7Mn2-xCuxO7 prepared by solid state reaction were investigated. The X-ray diffraction pattern shows that the two samples have Sr3Ti2O7 type perovskite structure. The two samples undergo complex transition with lowering temperature. The x = 0 samples, have the two-dimensional short-range ferromagnetic order at T＊= 231 K and then transform to the three-dimensional long-rangs ferromagnetic state at Tc = 114 K, at last they enter the canted antiferromagnetic state at TN = 56 K. The T＊, Tc and TN are all reduced at the 5% Cu doping level. Additionally, the two samples exhibited two distinct resistivity peaks, which is due to coexistence of the two phases. The metal-insulator transition temperature was decreased but the magnetoresistance was enhanced at the 5 % Cu doping level.
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