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首页> 外文期刊>Solid State Communications >The correlation between structure and magnetic properties in the manganites La_(0.7)Ca_(0.3-x)Te_xMnO_3 (0 ≤ x ≤ 0.15)
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The correlation between structure and magnetic properties in the manganites La_(0.7)Ca_(0.3-x)Te_xMnO_3 (0 ≤ x ≤ 0.15)

机译：锰矿La_（0.7）Ca_（0.3-x）Te_xMnO_3（0≤x≤0.15）中的结构与磁性之间的相关性

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摘要

The effect of Te-doping at La-site on structural, magnetic and transport properties in the manganites La_(0.7)Ca_(0.3-x)Te_xMnO_3 (0 ≤ x ≤ 0.15) has been investigated. All samples show an orthorhombic structure (O′-Pbnm) at room temperature. It shows that the Mn-O-Mn bond angle decreases and the Mn-O bond length increases with the increase in the Te content. All samples exhibit an insulator-metal (I-M) transition and the resistivity increases with the increase in the Te-doping level. Additionally, the Curie temperature T_c decreases and the transition becomes broader with increasing Te-doping level, in contrast, the magnetization of Te-doping samples at low temperatures decrease with increasing x as x ≤ 0.10 and then increase with further increasing x to 0.15. The results are discussed in terms of Jahn-Teller (JT) vibrational anisotropy Q_3/Q_2 and the opening of the new DE channel between Mn~(2+)-O-Mn~(3+) due to the introduction of Mn~(2+) ions because of the substitution of Te~(4+) ions for Ca~(2+) ions.
机译：研究了La位置的Te掺杂对锰La_（0.7）Ca_（0.3-x）Te_xMnO_3（0≤x≤0.15）的结构，磁性和输运性能的影响。所有样品在室温下均显示正交晶结构（O'-Pbnm）。结果表明，随着Te含量的增加，Mn-O-Mn键角减小，Mn-O键长增加。所有样品均表现出绝缘体-金属（I-M）过渡，并且电阻率随Te掺杂水平的提高而增加。此外，居里温度T_c随Te掺杂水平的增加而降低，跃迁变宽，相反，低温下Te掺杂样品的磁化强度随着x的增加而减小，x≤0.10，然后随着x的增加而增加，直至0.15。讨论了Jahn-Teller（JT）振动各向异性Q_3 / Q_2和由于引入Mn〜（2 +）-O-Mn〜（3+）之间新的DE通道而对结果进行了讨论。 2+）离子是因为Te〜（4+）离子取代了Ca〜（2+）离子。

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