Magnetic and anomalous electronic transport properties of the quaternary Heusler alloys Co2Ti1-xFexGe
Magnetic and anomalous electronic transport properties of the quaternary Heusler alloys Co2Ti1-xFexGe
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DOI：
10.1016/j.jmmm.2016.01.059
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发表时间：
2016-06-01
影响因子：
2.7
通讯作者：
Kumar, N. Harish
中科院分区：
文献类型：
--
作者：
Venkateswarlu, B.;Midhunlal, P. V.;Kumar, N. Harish
半金属Heusler合金Co2 TiGe具有低磁矩（2 ttB）的铁磁基态。它没有原子反位无序，但居里温度低（类似于390 K）。相反，另一种钴基Heusler合金Co2 FeGe具有高居里温度（类似于980 K）和高磁矩（5.6 ttB），同时表现出反位无序和缺乏半金属性。因此，它是感兴趣的，以调查这两种材料的固溶体的磁性和输运性质的对比特性。本文报道了四元Co_2Ti_（1-x）FexGe（x=0.2，0.4，0.6，0.8）Heusler合金的结构、磁性和电子输运性质。合金以L21结构结晶，但存在反位无序。磁化强度测试结果表明，合金为软磁型，居里温度高。观察到了偏离Slater-Pauling行为的电子输运性质的剧烈变化和一些反常的特征，用不同的散射机制解释了复杂的电子输运性质。(C)© 2016 Elsevier B. V.版权所有。
The half-metallic Heusler alloy Co2TiGe has a ferromagnetic ground state with a low magnetic moment (2 ttB). It is free of atomic antisite disorder but has low Curie temperature (similar to 390 K). In contrast the other cobalt based Heusler alloy Co2FeGe has high Curie temperature (similar to 980 K) and high magnetic moment (5.6 ttB) while exhibiting antisite disorder and lack of half-metallicity. Hence it is of interest to investigate the magnetic and transport properties of solid solutions of these two materials with contrasting characteristics. We report the structural, magnetic and electronic transport properties of quaternary Co2Ti1-xFexGe (x=0.2, 0.4, 0.6, 0.8) Heusler alloys. The alloys crystallize in L21 structure but with antisite disorder. The magnetization measurements revealed that the alloys were of soft ferromagnetic type with high Curie temperatures. Deviation from Slater-Pauling behavior and drastic change in electronic transport properties with some anomalous features were observed.The complex electronic transport properties have been explained using different scattering mechanisms. (C) 2016 Elsevier B.V. All rights reserved.