The effects of heat treatment on the electronic transport of La1.4Sr1.6Mn2O7+σ and La0.67Ca0.33MnO3+σ

C. J. Liu, M. S. Huang, C. S. Sheu

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

We report measurements of thermopower and resistivity for La1.4Sr1.6Mn2O7+σ and La0.67Ca0.33MnO3+σ ceramics treated in different temperatures and atmosphere. Chemical titration is used to determine both of the average valence of manganese and content of oxygen. As the samples are annealed at lower temperatures, the resistivities of both La1.4Sr1.6Mn2O7+σ and La0.67Ca0.33MnO3+σ reduce in magnitude. The effect of nitrogen-annealing leads to a reduction of the resistivity for La1.4Sr1.6Mn2O7+σ but an increase for La0.67Ca0.33MnO3+σ. Thermopower data suggest more than one type of carrier existing in the system. Transport data seem to support the polaron hopping in the high temperature regime.

原文English
頁(從 - 到)360-365
頁數6
期刊Chinese Journal of Physics
38
發行號2-2
出版狀態Published - 2000 十二月 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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