| Nd0.5Pb0.5-xSrx (Mn, Fe)O3的局域结构畸变和磁输运性质的研究 |
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| 引用本文： | 寇志起,邸乃力,鲁毅,马骁,李庆安,成昭华.Nd0.5Pb0.5-xSrx (Mn, Fe)O3的局域结构畸变和磁输运性质的研究[J].中国物理 B,2005,14(2):311-316. |
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| 作者姓名： | 寇志起 邸乃力 鲁毅 马骁 李庆安 成昭华 |
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| 作者单位： | State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China;State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China |
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| 基金项目： | Project supported by the State Key Project of Fundamental Research of China (Grand No 2001CB610605) and the National Natural Science Foundation of China (Grand No 10274104). |
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| 摘 要： | 通过X光衍射，穆斯堡尔谱和输运性质的测量研究了掺杂Fe的Nd0.5Pb0.5-xSrxMnO3样品的结构和磁输运性质。x光衍射和穆斯堡尔谱都表明了样品随Sr的增多结构畸变减小。Sr的掺杂同时也降低了室温时的电阻率并使磁电阻增大。由于在样品中Mn3+ 与 Mn4+的比率是一样的，也就意味着具有相同的双交换作用。所以Sr对样品性质的改变可以认为是由于晶格畸变所产生的。由于Jahn-Teller 效应而产生的Mn(Fe)O6八面体的局域结构畸变可以局域电子。由我们的实验可以看到在居里温度Tc以上，除了双交换作用之外，Jahn-Teller 效应对于输运性质也起了重要作用。
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| 关 键 词： | 穆斯堡尔谱 Jahn-Teller畸变 庞磁电阻（CMR） |
| 收稿时间： | 7/9/2004 12:00:00 AM |
Local structural distortion and magnetotransport properties of Nd0.5Pb0.5-xSrx (Mn, Fe)O3 |
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| Kou Zhi-Qi,Di Nai-Li,Lu Yi,Ma Xiao,Li Qing-An and Cheng Zhao-Hua.Local structural distortion and magnetotransport properties of Nd0.5Pb0.5-xSrx (Mn, Fe)O3[J].Chinese Physics B,2005,14(2):311-316. |
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| Authors: | Kou Zhi-Qi Di Nai-Li Lu Yi Ma Xiao Li Qing-An and Cheng Zhao-Hua |
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| Affiliation: | State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China |
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| Abstract: | Structural and magnetotransport properties of Fe-doped Nd0.5Pb0.5-xSrx (Mn, Fe)O3 are investigated by means of x-ray diffraction (XRD), M?ssbauer spectroscopy and transport measurements. Both XRD patterns and M?ssbauer spectra indicate that structural distortion decreases with Sr doping. Furthermore, it is found that Sr doping results in decrease of the resistivity at room temperature and increase of magnetoresistance. In samples, the same ratio of Mn3+ to Mn4+ is kept. So we would rather attribute these changes to the local structural distortion than the double exchange (DE) interaction. The local structural distortion of the Mn(Fe)O6 octahedron which results from the Jahn—Teller effect, can localize the conduction electrons. In this regard, we provide another evidence to prove that this Jahn—Teller distortion is an important factor that affects the transport property above Tc besides the DE coupling. |
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| Keywords: | M?ssbauer spectroscopy Jahn—Teller distortion colossal magnetoresistance |
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