Enhancement of anomalous Hall effect in a filling-changed pyrochlore-type molybdate
Enhancement of anomalous Hall effect in a filling-changed pyrochlore-type molybdate
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DOI：
10.1209/epl/i2001-00255-3
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发表时间：
2001-05
期刊：
影响因子：
1.8
通讯作者：
Y. Taguchi;Y. Tokura
中科院分区：
文献类型：
--
作者：
Y. Taguchi;Y. Tokura
研究了具有烧绿石晶格的金属铁磁体（Sm1 − xCax）2Mo2O7（x = 0和0.1）的反常霍尔效应。虽然纵向电导率和磁化强度在部分Ca取代后几乎没有变化，但异常霍尔效应或向低温增加的横向电导率急剧增强。与Y掺杂的化合物（Sm0.9Y0.1）2Mo2O7的比较表明，带填充的变化是横向电导率大的变化所必需的。通过测量的AC磁化率，玻璃质的性质是指示的铁磁状态的Ca掺杂的化合物，这可能是从增加的倾斜角的Mo自旋。由此产生的自旋手征性的增强和相关的Berry相可能是异常霍尔效应急剧增加的原因。
Anomalous Hall effect has been investigated for metallic ferromagnets with a pyrochlore lattice, (Sm1 − xCax)2Mo2O7, with x = 0 and 0.1. While longitudinal conductivity and magnetization undergo little change upon the partial Ca substitution, the anomalous Hall effect or transverse conductivity increasing toward low temperature is drastically enhanced. Comparison with a Y-doped compound (Sm0.9Y0.1)2Mo2O7 has revealed that the change of band filling is essential for the large variation in the transverse conductivity. By measurements of AC susceptibility, a glassy nature is indicated for the ferromagnetic state of the Ca-doped compound, which arises perhaps from an increased tilting angle of Mo spins. The resultant enhancement of the spin chirality and the associated Berry phase are likely responsible for the drastic increase of the anomalous Hall effect.