Electric transport properties and temperature stability of magnetoresistance of composite system between La8/9Sr1/45Na4/45MnO3 and Sb2O3
来源期刊：Rare Metals2013年第4期
论文作者：Gui-Ying Wang Yong-Gang Tang Qi-Xiang Song Ming-Yu Zhang Zhen-Sheng Peng
文章页码：363 - 368
摘 要：The samples of La8/9Sr1/45Na4/45MnO3（LSNMO）/x2（Sb2O3） were prepared by the solid-state reaction method. The electric transport properties and the temperature stability of magnetoresistance（MR） of the samples were studied through the measurements of X-ray diffraction patterns, resistivity–temperature（q–T） curves, mass magnetization– temperature（r–T） curves, and magnetoresistance–temperature（MR–T） curves. The results indicate that the q–T curves of the original material LSNMO show two peaks, and the phenomenon of two peaks of q–T curves disappears for the composite samples, which can be explained by a competition between surface-phase resistivity induced by boundarydependent scattering and body-phase resistivity induced by paramagnetism–ferromagnetism transition. For all the samples in the low temperature range, MR increases continuously with the decrease of temperature, which shows a characteristic of low-field magnetoresistance. However, MR basically keeps the same in the high temperature range. The paramagnetism–ferromagnetism transition is observed in the high temperature range due to a composite between perovskite manganite and insulator, which can enhance the temperature of MR appearance in the high temperature range and make it to appear near room temperature. For the sample with x = 0.12, MR remains constant at the value of 7.5 % in the temperature range of 300–260 K, which achieves a temperature stability of MR near room temperature. In addition,for the sample with x = 0.16, MR is above 6.8 % in the high temperature range of 318–252 K（DT = 66 K）. MR almost remains constant in this temperature range, which favors the practical application of MR.
Gui-Ying Wang1,2，Yong-Gang Tang1,2，Qi-Xiang Song1，Ming-Yu Zhang1,2，Zhen-Sheng Peng1
1. Anhui Key Laboratory of Spintronic and Nano-materials Research2. School of Mechanical and Electronic Engineering,Suzhou University
摘 要：The samples of La8/9Sr1/45Na4/45MnO3（LSNMO）/x2（Sb2O3） were prepared by the solid-state reaction method. The electric transport properties and the temperature stability of magnetoresistance（MR） of the samples were studied through the measurements of X-ray diffraction patterns, resistivity–temperature（q–T） curves, mass magnetization– temperature（r–T） curves, and magnetoresistance–temperature（MR–T） curves. The results indicate that the q–T curves of the original material LSNMO show two peaks, and the phenomenon of two peaks of q–T curves disappears for the composite samples, which can be explained by a competition between surface-phase resistivity induced by boundarydependent scattering and body-phase resistivity induced by paramagnetism–ferromagnetism transition. For all the samples in the low temperature range, MR increases continuously with the decrease of temperature, which shows a characteristic of low-field magnetoresistance. However, MR basically keeps the same in the high temperature range. The paramagnetism–ferromagnetism transition is observed in the high temperature range due to a composite between perovskite manganite and insulator, which can enhance the temperature of MR appearance in the high temperature range and make it to appear near room temperature. For the sample with x = 0.12, MR remains constant at the value of 7.5 % in the temperature range of 300–260 K, which achieves a temperature stability of MR near room temperature. In addition,for the sample with x = 0.16, MR is above 6.8 % in the high temperature range of 318–252 K（DT = 66 K）. MR almost remains constant in this temperature range, which favors the practical application of MR.
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