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首页> 外文期刊>Physica status solidi, B. Basic research >Influence of Ni doping on the electrical and structural properties of FeSb _2
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Influence of Ni doping on the electrical and structural properties of FeSb _2

机译：镍掺杂对FeSb _2电学和结构性能的影响

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摘要

The influence of increasing Ni doping on the structural and magneto-transport properties of FeSb _2 have been investigated by synthesizing Fe _(1-x)Ni _xSb _2 samples with x=0-0.4 using solid-state reaction method. The samples are single phase from x=0-0.1 with the marcasite (FeS _2)-type structure. Beyond x>0.2 the skutterudite (CoAs _3)-type phase starts progressively separating out apart from the required marcasite phase. The temperature-dependent electrical resistivity studies in the range 4.2-300K reveal activation behavior in the high-temperature (HT) regime (T>70K) with a narrow gap. The gap value increases with Ni content x. In contrast, a variable-range hopping (VRH) type transport is seen in the low-temperature (LT) regime. The VRH parameter T _0 progressively diminishes with increasing x. A detailed analysis of magnetoresistance using the Shklovskii-Efros model in the VRH regime indicates the increase of localization length with increasing Ni content. An insulator to metal transition is observed in the LT regime for x=0.1. This is ascribed to arise on account of delocalization of localized states within the gap.
机译：通过固相反应法合成x = 0-0.4的Fe _（1-x）Ni _xSb _2样品，研究了增加Ni掺杂对FeSb _2的结构和磁输运性能的影响。样品是x = 0-0.1的单相，具有镁铁矿（FeS _2）型结构。超过x> 0.2时，方钴矿（CoAs _3）型相开始逐渐与所需的镁铁矿相分离。温度依赖性电阻率研究在4.2-300K范围内，揭示了在高温（HT）范围（T> 70K）中具有窄间隙的活化行为。间隙值随着Ni含量x而增加。相反，在低温（LT）方案中可以看到可变范围跳跃（VRH）类型的运输。 VRH参数T _0随着x的增加而逐渐减小。在VRH模式下使用Shklovskii-Efros模型对磁阻进行的详细分析表明，随着Ni含量的增加，定位长度会增加。对于x ＝ 0.1，在LT状态中观察到绝缘体到金属的转变。这归因于间隙内局部状态的离域化。

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