Electrical-resistance maximum near the Curie point in (Fe1-xVx)3Ga and (Fe1-xTix)3Ga.
Electrical-resistance maximum near the Curie point in (Fe1-xVx)3Ga and (Fe1-xTix)3Ga.
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DOI：
10.1103/physrevb.44.12406
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发表时间：
1991-12
期刊：
影响因子：
--
通讯作者：
Kawamiya;Nishino;Matsuo;Asano
中科院分区：
文献类型：
--
作者：
Kawamiya;Nishino;Matsuo;Asano
在 4.2 至 1250 K 的温度范围内测量了 D 0 3 型 (Fe 1− x V x) 3 Ga 和 (Fe 1− x Ti x) 3 Ga 合金的电阻率。电阻率的温度依赖性显示出铁磁 3d 合金中发现的异常现象：在居里点附近出现电阻最大值，而在高达 1000 K 及以上的高温下出现负温度依赖性。随着V或Ti组成的增加，电阻率的负温度依赖性趋势显着增加。这种反常的电阻行为不能用有序-无序转变来解释，因为即使在室温以下电阻率也会下降。在高于 800 K 的温度下，电阻率的逐步降低表现为转变的标志，从而终止了负温度系数范围。对电阻率各个组成部分的仔细检查表明，磁散射电阻是普通铁磁3d合金的5到10倍，并且在各自的合金中，残余电阻率以at.% V的12 μΩ cm和14 μΩ cm的极高速率增加。结论是(Fe 1- x M x) 3 Ga(M＝V和Ti)是一种不被分类为迄今为止已知的表现出负电阻率温度系数的几种其他类型的金属导体的导体。
The electrical resistivity of the D 0 3-type (Fe 1− x V x) 3 Ga and (Fe 1− x Ti x) 3 Ga alloys has been measured over the temperature range from 4.2 to 1250 K. The temperature dependence of the resistivity shows an anomaly that has been found in ferromagnetic 3d alloys: an appearance of the resistance maximum near the Curie point and the negative temperature dependence at high temperatures up to 1000 K and above. The tendency of the negative temperature dependence of the resistivity increases markedly with increasing the V or Ti composition. Such an anomalous resistance behavior cannot be accounted for in terms of an order-disorder transformation, since the decrease in the resistivity occurs even below room temperature. At a temperature higher than 800 K, a stepwise reduction of the resistivity appears as a sign of the transformation, which terminates the negative-temperature-coefficient range. Close examination of various components of the resistivity reveals that the magnetic scattering resistance is five to ten times as large as those of ordinary ferromagnetic 3d alloys and that the residual resistivity increases at an extremely large rate of 12 μΩ cm for at.% V and 14 μΩ cm for at.% Ti in the respective alloys. It is concluded that (Fe 1− x M x) 3 Ga (M= V and Ti) is a type of conductor not to be classified into several other types of metallic conductors hitherto known to exhibit a negative temperature coefficient of resistivity.