Spontaneous resistivity anisotropy and band structure of La 0.7 Ca 0.3 MnO 3 and Fe 3 O 4 films
Spontaneous resistivity anisotropy and band structure of La 0.7 Ca 0.3 MnO 3 and Fe 3 O 4 films
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DOI：
10.1103/physrevb.62.1044
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发表时间：
2000-07
影响因子：
3.7
通讯作者：
M. Ziese
中科院分区：
文献类型：
--
作者：
M. Ziese
测量了La0.7Ca0.3MnO3和Fe3O4薄膜在不同电流和磁场方向上的自发电阻率各向异性随温度的变化。用原子态模型的计算代替了双电流模型中的计算，分析了各向异性磁阻。La0.7Ca0.3MnO3的磁阻特性表明，只有多数电子导电，而至少有两个分别具有多数和少数特征的带对Fe3O4薄膜的磁输运特性有贡献.这一发现与磁铁矿观察到的小的自旋极化值是一致的。
The spontaneous resistivity anisotropy of La 0.7 Ca 0.3 MnO 3 and Fe 3 O 4 films was measured as a function of temperature for various current and magnetic field directions. The anisotropic magnetoresistance was analyzed within the two-current model substituted by a calculation within an atomic state model. The magnetoresistance of La 0.7 Ca 0.3 MnO 3 indicates that only majority electrons conduct current, whereas at least two bands of majority and minority character, respectively, contribute to the magnetotransport properties of Fe 3 O 4 films. This finding is consistent with the small spin-polarization values observed for magnetite.