AC properties of Pr0.7Ca0.3MnO3 ceramics

被引：1

作者：

Shi Da-Wei ^{[1
]}

Wu Mei-Ling ^{[1
]}

Yang Chang-Ping ^{[1
]}

Ren Chun-Ling ^{[1
]}

Xiao Hai-Bo ^{[1
]}

Wang Kai-Ying ^{[2
]}

机构：

[1] Hubei Univ, Fac Phys & Elect Technol, Wuhan 430062, Peoples R China

[2] Vestfold Univ Coll HiVe, Dept Micro & Nano Syst Technol, N-3184 Horten, Norway

来源：

ACTA PHYSICA SINICA | 2013年 / 62卷 / 02期

基金：

中国国家自然科学基金;

关键词：

perovskite manganite oxide; colossal magnetoresistance (CMR); Schottky barrier; space charge region;

D O I：

10.7498/aps.62.026201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Ceramic Pr1-xCaxMnO3(x = 0.3) samples are prepared by solid-state reaction and measured using direct current (DC) and alternating current (AC) methods in different magnetic and electrical fields. A Curie temperature of 150 K is determined by I-V measurements in field for Pr0.7Ca0.3MnO3, which is consistent with that from vibrating sample magnetometer (VSM). The AC measurement shows that the grain boundary resistance reduces with magnetic field increasing, while the grain almost keeps unchanged, and it indicates that the colossal magnetoresistance (CMR) effect in low field mainly comes from the grain boundary for the Pr0.7Ca0.3MnO3 ceramic. The barrier height of grain boundary is 117 meV for the Pr0.7Ca0.3MnO3 ceramic, obtained by fitting the temperature spectrum of impedance, and it is well coincident with that from fitting the R-T data. A "trap state" model is proposed to explain all the measured data.

引用

页数：7

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