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題名: Magnetoresistance and Magnetothermopower of Nitrogen-annealed RE1.2Sr1.8Mn2O7+δ(RE = Nd, Pr)
作者: Sheu, C. S.;Huang, M. S.;Wu, T. W.;Liu, Chia-Jyi
貢獻者: 物理學系
關鍵詞: Layered manganites;Mangetotransport;Polaronic transport
日期: 2002-02
上傳時間: 2012-09-10T06:13:54Z
出版者: Elsevier
摘要: We report measurements of resistance and thermopower of RE1.2Sr1.8Mn2O7+δ (RE=Nd, Pr) ceramics up to a magnetic field of 5 T. Nitrogen annealing has dramatic effects on the transport in reducing the resistivity, shifting peak resistivity to a higher temperature, and shifting thermopower to more negative values. The value of ΔJT increases as a result of nitrogen annealing, indicating an enhanced Jahn–Teller distortion due to the increased Mn3+ concentration. These results are consistent with the effects of nitrogen annealing on the transport of RE=La.
關聯: J. Magn. Magn. Mater., 239(1-3): 192-194
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