Crossover of magnetoresistance in the zero-gap half-metallic Heusler alloy Fe2CoSi
Crossover of magnetoresistance in the zero-gap half-metallic Heusler alloy Fe2CoSi
复制标题
零间隙半金属 Heusler 合金 Fe2CoSi 中磁阻的交叉
DOI:
10.1209/0295-5075/103/37011
复制
发表时间:
2013-08-01
期刊:
影响因子:
1.8
通讯作者:
Wu, G. H.
中科院分区:
文献类型:
--
作者:
Du, Y.;Xu, G. Z.;Wu, G. H.
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.