National Changhua University of Education Institutional Repository : Item 987654321/14166
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題名: Nitrogen-annealing Effects on the Electrical Resistivity and Thermopower of Layered La1.4Sr1.6Mn2O Ceramics
作者: Liu, Chia-Jyi;Sheu, C. S.;Huang, M. S.
貢獻者: 物理學系
日期: 2000-06
上傳時間: 2012-09-10T06:13:45Z
出版者: The American Physical Society
摘要: We report measurements of thermopower and resistivity as a function of temperature on bilayered La1.4Sr1.6Mn2O7+δ ceramics treated in different atmosphere in H=0 and 5 T. Chemical titration is used to determine both valence of manganese and content of oxygen. As the sample is annealed in nitrogen, the resistivity of La1.4Sr1.6Mn2O7+δ reduces; the peak resistivity shifts to a higher temperature; the magnetoresistance ratio is enhanced; and the thermopower shifts to a more negative value over the investigated temperature range as compared to the sample annealed in oxygen. These results show that annealing samples in flowing nitrogen has the same effect as the pressure-induced shift of transport behavior. In addition, thermopower data of our ceramic materials resemble those within the ab plane of a single crystal. Transport data will be discussed in terms of the polaron hopping.
關聯: Phys. Rev. B, 61(21): 14323-14326
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