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AC properties of Pr0.7Ca0.3MnO3 ceramics

Shi Da-Wei Wu Mei-Ling Yang Chang-Ping Ren Chun-Ling Xiao Hai-Bo Wang Kai-Ying

AC properties of Pr0.7Ca0.3MnO3 ceramics

Shi Da-Wei, Wu Mei-Ling, Yang Chang-Ping, Ren Chun-Ling, Xiao Hai-Bo, Wang Kai-Ying
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  • Received Date:  01 July 2012
  • Accepted Date:  21 August 2012
  • Published Online:  20 January 2013

AC properties of Pr0.7Ca0.3MnO3 ceramics

  • 1. Faculty of Physics and Electronic Technology, Hubei University, Wuhan 430062 China;
  • 2. Department of Micro and Nano Systems Technology, Vestfold University College - HiVe, Horten 3184, Norway
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 11074067, 11174073).

Abstract: 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.

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