Connection of Thermopower, Magneto Thermopower with Resistivity and Magnetoresistivity in Nd (1-x) Sr x MnO 3 and Sm (1-x) Sr x MnO 3 Manganites

American Journal of Physics and Applications Pub Date : 2017-10-13 DOI:10.11648/j.ajpa.20170506.12

L. Koroleva, I. Batashev, A. Morozov, A. Balbashov, H. Szymczak, A. Ślawska-Waniewska, S. Lewińska

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Abstract

An experimental study of thermopower, magneto thermopower, magnetoresistivity and magnetization of Nd(1-x)SrxMnO3 and Sm(1-x)SrxMnO3 with 0 ≤ х ≤ 0.3 was conducted. A steep rise of thermopower as well as giant values of magneto thermopower and magnetoresistivity were observed near Curie temperature ТС in compounds with 0.15 ≤ х ≤ 0.3. On the other hand, no special features were found in case of х = 0. It has been known that compounds with 0.1 ≤ х ≤ 0.3 consist of ferromagnetic clusters of ferron (magnetic polaron) type located in A-type antiferromagnetic matrix. An increase of thermopower near ТС is caused by ferrons as with the application of magnetic field or temperatures higher than ТС thermopower falls sharply due to the destruction of ferrons. So, the value of thermopower is directly connected to the number of magnetic polarons in sample. Therefore, thermopower in doped magnetic semiconductors is determined by level of doping and volume of the sample.

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Nd (1-x) Sr x mno3和Sm (1-x) Sr x mno3锰矿中热电、磁热电与电阻率和磁电阻率的关系

对Nd(1-x)SrxMnO3和Sm(1-x)SrxMnO3的热功率、磁热功率、磁电阻率和磁化强度进行了实验研究。在居里温度ТС附近，当化合物的温度为0.15≤≤0.3时，热功率急剧上升，磁热功率和磁电阻率均出现巨大值。另一方面，我们没有发现在= 0的情况下有什么特殊的特征。已知0.1≤≤0.3的化合物是由位于a型反铁磁矩阵中的铁(磁极化子)型铁磁团簇组成的。在ТС附近的热功率增加是由铁原子引起的，当施加磁场或温度高于ТС时，由于铁原子的破坏，热功率急剧下降。因此，热功率的大小与样品中磁极化子的数量直接相关。因此，掺杂磁性半导体的热功率是由掺杂水平和样品体积决定的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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American Journal of Physics and Applications

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