Crossover of magnetoresistance in the zero-gap half-metallic Heusler alloy Fe2CoSi

Crossover of magnetoresistance in the zero-gap half-metallic Heusler alloy Fe2CoSi
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零间隙半金属 Heusler 合金 Fe2CoSi 中磁阻的交叉

DOI:
10.1209/0295-5075/103/37011
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发表时间:
2013-08-01
期刊:
EPL
影响因子:
1.8
通讯作者:
Wu, G. H.
Wu, G. H.
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Du, Y.;Xu, G. Z.;Wu, G. H.

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这项工作报告了逆赫斯勒化合物 Fe2CoSi 的能带结构和磁输运研究。第一性原理计算表明,Fe2CoSi具有非常奇特的能带结构,多数自旋沟道具有导电性,少数自旋沟道几乎为零带隙。制备的 Fe2CoSi 样品具有高度有序的逆 Heusler 结构,磁矩为 5 K,居里温度高达 1038 K。随着温度的升高,观察到从正磁阻 (MR) 到负磁阻 (MR) 的交叉。将此与霍尔效应测量相结合,我们认为磁流变的有趣交叉可以归因于在费米能级从无带隙少数自旋通道变为多数自旋通道的主要自旋载流子。
This work reports on band structure and magneto-transport investigations of the inverse Heusler compound Fe2CoSi. First-principles calculations show that Fe2CoSi has a very peculiar band structure with a conducting property of the majority spin channel and a nearly zero bandgap in the minority spin channel. The prepared Fe2CoSi sample possesses a highly ordered inverse Heusler structure with a magnetic moment of at 5 K and a high Curie temperature of 1038 K. With increasing temperature, a crossover from positive to negative magnetoresistance (MR) is observed. Combining this with the Hall effect measurements, we suggest that the intriguing crossover of the MR can be ascribed to the dominant spin carriers that change from the gapless minority spin channel to the majority spin channel at the Fermi level.