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首页> 外文期刊>Physica status solidi, B. Basic research >Comparing study of magnetic-ion and nonmagnetic-ion doping effect at Mn site in La_(0.825)Sr_(0.175)MnO_3 compound
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Comparing study of magnetic-ion and nonmagnetic-ion doping effect at Mn site in La_(0.825)Sr_(0.175)MnO_3 compound

机译：La_（0.825）Sr_（0.175）MnO_3化合物中Mn部位的磁离子和非磁离子掺杂效应的比较研究

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摘要

Structural, magnetic, and transport properties of La_(0.825)Sr_(0.175)MnO_3 samples doped with magnetic (Fe~(3+), Cr~(3+)) and nonmagnetic (Ga~(3+), Al~(3+)) ions have been studied comparatively. The structure does not change by nonmagnetic ion doping, whereas magnetic ion substitution can change the structure of the system significantly. All the doped samples show a lower Curie temperature as compared to that of the undoped sample. The change of Curie temperature T_C for the magnetic-ion-doped samples is quite larger than that of the nonmagnetic-ion-doped samples. The electron configuration is suggested to play an important role in determining the change of T_C for the magnetic-ion-doped samples, whereas the decrease of T_C in nonmagnetic-doped samples is considered to originate mainly from the variation of local lattice. The Fedoped sample shows semiconducting transport behavior in the whole studied temperature range besides a kink near T_C. Except for two obvious M–I transitions, another inflexion-like anomaly in the ρ(T) curve at low temperatures is observed for the Ga-, Cr-, and Al-doped samples and the inflexion is suggested to be related to a two transport channel model in these samples.
机译：掺有磁性（Fe〜（3 +），Cr〜（3+））和非磁性（Ga〜（3 +），Al〜（3）的La_（0.825）Sr_（0.175）MnO_3样品的结构，磁性和输运性质+））离子已经过比较研究。非磁性离子掺杂不会改变结构，而磁性离子取代会显着改变系统的结构。与未掺杂样品相比，所有掺杂样品均显示出较低的居里温度。掺杂了磁性离子的样品的居里温度T_C的变化比未掺杂了磁性离子的样品的居里温度T_C大得多。建议电子构型在确定掺杂磁性离子的样品中T_C的变化中起重要作用，而认为在非磁性掺杂样品中T_C的降低主要源自局部晶格的变化。 Fe掺杂的样品除了在T_C附近扭结外，还显示了在整个研究温度范围内的半导体传输行为。除了两个明显的M–I跃迁之外，Ga，Cr和Al掺杂的样品在低温下在ρ（T）曲线中还出现了类似拐点的异常现象，建议该拐点与两个拐点有关。这些样本中的运输渠道模型。

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