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首页> 外文期刊>Solid State Communications >Improved magnetotransport in LCMO-Polymer (PPS) composite
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Improved magnetotransport in LCMO-Polymer (PPS) composite

机译：LCMO-聚合物（PPS）复合材料中改进的磁传输

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摘要

Polymer embedded, La_(0.7)Ca_(0.3)MnO_3/polyphenylene sulfide (LCMO)_(1-x)/(PPS)_x (with x ～ 0, 0.10, 0.20 and 0.30, x is the weight fraction of PPS), composites were prepared and their magnetotransport properties were investigated. X-ray diffraction and scanning electron microscopy observations indicate that there is no reaction between the LCMO and PPS. It has been observed that the incorporation of PPS phase into the LCMO matrix sharply increases the resistivity and lowers the metal-insulator transition temperature (T_(IM)). Magnetic measurement reveals that the ferromagnetic order of LCMO is suppressed by the addition of nonmagnetic PPS. The significant enhancement in magnetoresistance (MR) is observed at low temperature below 175 K for the composites with x = 0.10 and 0.20 with respect to pure LCMO at magnetic field H ～ 3 kOe. We suggest that such enhancement in MR is because of spin disorder caused through enhanced spin-polarized tunneling at the grain boundaries in the composite samples.
机译：嵌入聚合物La_（0.7）Ca_（0.3）MnO_3 /聚苯硫醚（LCMO）_（1-x）/（PPS）_x（x分别为0、0.10、0.20和0.30，x为PPS的重量分数），制备了复合材料，并研究了它们的磁传输性能。 X射线衍射和扫描电子显微镜观察表明，LCMO和PPS之间没有反应。已经观察到，将PPS相掺入LCMO基质中会急剧增加电阻率并降低金属-绝缘体的转变温度（T_（IM））。磁性测量表明，通过添加非磁性PPS可以抑制LCMO的铁磁有序。对于x = 0.10和0.20的复合材料，在磁场H〜3 kOe下，相对于纯LCMO，在低于175 K的低温下观察到磁阻（MR）显着提高。我们认为，MR的这种增强是由于复合样品中晶界处的自旋极化隧穿增强而引起的自旋紊乱。

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