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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Structural and magnetic heterogeneities, phase transitions, and magnetoresistance and magnetoresonance properties of the composition ceramic La _(0.7)Pb _(0.3-x)Sn _xMnO _3
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Structural and magnetic heterogeneities, phase transitions, and magnetoresistance and magnetoresonance properties of the composition ceramic La _(0.7)Pb _(0.3-x)Sn _xMnO _3

机译：组成陶瓷La _（0.7）Pb _（0.3-x）Sn _xMnO _3的结构和磁异质性，相变以及磁阻和磁谐振特性

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摘要

The La _(0.7)Pb _(0.3-x)Sn _xMnO _3 composition ceramic is studied by X-ray diffraction, resistive, magnetic, electron-microscopic, magnetoresistance, and NMR (55 Mn, 139 La) methods. The substitution of tin for lead results in structural phase separation into the basic perovskite (mathematical equation represented) and spinell (Fd3m), phases: La _(0.7)Pb _(0.3-x)Sn _xMnO _3? La _(0.7)Pb _(0.3-x)Sn _xMnO _3 + 0.5xLa _2Sn _2O _7. Changes in the lattice parameter of the basic perovskite mathematical equation represented structure, the electrical resistivity, and the magnetic and magnetoresistance properties are caused by changes in the composition and content of a conducting perovskite ferromagnetic phase, the Mn ~(3+)/Mn ~(4+) ratio, and the imperfection of vacancy and cluster types. An in-plane nanostructured cluster is formed by Mn ~(2+) ions located in distorted A-positions. The detected anomalous magnetic hysteresis is induced by the appearance of a unidirectional exchange anisotropy at the boundary of an in-plane antiferromagnetic cluster coherently joined with a ferromagnetic matrix structure. The broad asymmetric NMR spectra of 55Mn and 139 ~(La) indicate a high-frequency Mn ~(3+)?Mn ~(4+) superexchange and a nonuniform distribution of ions and defects. The constructed phase diagram characterizes a strong relation between the magnetic and transport properties in rare-earth manganites.
机译：通过X射线衍射，电阻，磁，电子显微镜，磁阻和NMR（55 Mn，139 La）方法研究了La _（0.7）Pb _（0.3-x）Sn _xMnO _3复合陶瓷。用锡代替铅会导致结构相分离成基本钙钛矿（表示数学方程）和尖晶石（Fd3m），相：La _（0.7）Pb _（0.3-x）Sn _xMnO _3？ La _（0.7）Pb _（0.3-x）Sn _xMnO _3 + 0.5xLa _2Sn _2O _7。钙钛矿基本数学方程表示的结构，电阻率以及磁和磁阻特性的晶格参数的变化是由导电钙钛矿铁磁相Mn〜（3 +）/ Mn〜的组成和含量的变化引起的（4+）比率，以及空缺和簇类型的缺陷。面内纳米结构簇是由位于扭曲的A位置的Mn〜（2+）离子形成的。检测到的异常磁滞是通过在与铁磁矩阵结构相干连接的面内反铁磁簇的边界处出现单向交换各向异性引起的。 55Mn和139〜（La）的宽的不对称NMR光谱表明，高频Mn〜（3+）→Mn〜（4+）超交换，并且离子和缺陷的分布不均匀。所构建的相图表征了稀土锰矿中磁性与传输性能之间的密切关系。

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