Transport properties of the ferromagnetic Heusler alloy Co 2 TiSn
Transport properties of the ferromagnetic Heusler alloy Co 2 TiSn
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DOI：
10.1103/physrevb.72.012417
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发表时间：
2005-06
影响因子：
3.7
通讯作者：
S. Majumdar;M. Chattopadhyay;V. Sharma;K. S. Sokhey;S. Roy;P. Chaddah
中科院分区：
文献类型：
--
作者：
S. Majumdar;M. Chattopadhyay;V. Sharma;K. S. Sokhey;S. Roy;P. Chaddah
我们报告的磁化强度，零场电阻率，磁阻测量的铁磁Heusler合金${\mathrm{Co}}_{2}\mathrm{TiSn}$的结果。当体系经历顺磁到铁磁的转变时，电子输运特性发生了显著的变化。在顺磁状态下，电子输运的性质类似于半导体。这在铁磁有序开始时突然改变为金属行为。外部磁场的应用往往会抑制这种类似于超导的传输，导致在居里温度附近达到峰值的负磁阻。与其他系统，包括UNiSn和锰氧化物中观察到的类似的不寻常的行为进行比较。
We report the results of magnetization, zero-field resistivity, and magnetoresistance measurements in the ferromagnetic Heusler alloy ${\mathrm{Co}}_{2}\mathrm{TiSn}$. There is a striking change in the character of electron transport as the system undergoes the paramagnetic to ferromagnetic transition. In the paramagnetic state, the nature of the electron transport is like that of a semiconductor. This changes abruptly to metallic behavior at the onset of ferromagnetic ordering. Application of external magnetic field tends to suppress this semiconducting-like transport leading to a negative magnetoresistance that reaches a peak in the vicinity of the Curie temperature. Comparison is made with the similar unusual behavior observed in other systems, including UNiSn and manganites.