Unusual hysteresis and giant low-field magnetoresistance in polycrystalline sample with nominal composition of La2/3Ca1/3Mn0.955Cu0.045O3 -: art. no. 172402

被引：20

作者：

Yuan, SL ^{[1
]}

Yang, YP ^{[1
]}

Xia, ZC ^{[1
]}

Liu, L ^{[1
]}

Zhang, GH ^{[1
]}

Feng, W ^{[1
]}

Tang, J ^{[1
]}

Zhang, LJ ^{[1
]}

Liu, S ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Dept Phys, Wuhan 430074, Peoples R China

来源：

PHYSICAL REVIEW B | 2002年 / 66卷 / 17期

关键词：

D O I：

10.1103/PhysRevB.66.172402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Unusual thermal and magnetic hysteresis is observed near the insulator-metal transition of La2/3Ca1/3Mn1-xCuxO3 (x=4.5%). For the temperature range at which the hysteresis appears, the sample shows unusual giant magnetoresistance (MR) behavior even for a low field of similar to0.3 T. The maximum MR has a value of Deltarho/rho(H=0) as high as similar to90% for the 0.3 T field. A possible discussion is presented by considering the sample as a granular system consisting of manganese grains surrounded by some surface layer created due to the Cu segregation towards the grain surface.

引用

页码：1 / 4

页数：4

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