Metamagnetic-transition-induced giant magnetoresistance in Mn2Sb1-xSnx (0 < x <= 0.4) compounds
Metamagnetic-transition-induced giant magnetoresistance in Mn2Sb1-xSnx (0 < x <= 0.4) compounds
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DOI：
10.1103/physrevb.67.132405
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发表时间：
2003-04
影响因子：
3.7
通讯作者：
Yu-qin Zhang;Zhidong Zhang
中科院分区：
文献类型：
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作者：
Yu-qin Zhang;Zhidong Zhang
在Mn_2Sb_（1-x）Sn_x（0<x ≤ 0.4）化合物中，外场可以诱导从反铁磁到亚铁磁的变磁转变，并伴随着巨磁电阻效应。Mn_2Sb_（0.85）Sn_（0.15）在142 K、5 T磁场下的巨磁电阻率最大，达到60%。GMR的场依赖性和Mn_2Sb_（0.6）Sn_（0.4）的磁化强度证实了系统中的GMR效应是由场致变磁转变引起的。从变磁转变后超带隙的崩塌导致费米面重构的角度讨论了巨磁电阻效应的起源。
In Mn2Sb1-xSnx (0<xless than or equal to0.4) compounds, a metamagnetic transition from antiferromagnetic to ferrimagnetic can be induced by an external field, with which a giant magnetoresistance (GMR) effect is associated. The largest GMR ratio of 60% for Mn2Sb0.85Sn0.15 is achieved at 142 K at a field of 5 T. The field dependence of GMR and the magnetization of Mn2Sb0.6Sn0.4 confirm that the field-induced metamagnetic transition gives rise to the GMR effect in the system. The origin of the GMR effect is discussed in terms of the reconstruction of Fermi surface due to the collapse of the super zone gap after the metamagnetic transition.