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

doi:10.7498/aps.62.026201

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.

Keywords:

Authors and contacts

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
Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 11074067, 11174073).

References

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Cited By

[1]	Jin S, Tiefel T H, McCormack M, Fastnacht R A, Ramesh R, Chen L H 1994 Science 264 413
[2]	Dagotto E, Hotta T, Moreo A 2001 Phys. Report 344 1
[3]	Liu J M, Wang K F 2005 Progress in Physics 25 82 (in Chinese) [刘俊明, 王克锋 2005 物理学进展 25 82]
[4]	Dong S, Liu J M 2010 Progress in Physics 30 1 (in Chinese) [董帅, 刘俊明 2010 物理学进展 30 1]
[5]	Martin C, Maignan A, Hervieu M, Raveau B 2002 Phys. Rev. B 66 094410
[6]	Yang C P, Chen S S, Zhou Z H, Xu L F, Wang H, Hu J F, Morchshakov V, Bärner K 2007 J. Appl. Phys. 101 063909

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Catalog

Vol. 62, Issue 2 - 2013-01-20

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