Thermal Magnetoconductivity of Tungsten Below 6 K: Combining the Zero-, Low- and High-Field Cases
Thermal Magnetoconductivity of Tungsten Below 6 K: Combining the Zero-, Low- and High-Field Cases
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DOI：
10.1007/s10909-014-1220-7
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发表时间：
2015
影响因子：
2
通讯作者：
M. Hills;I. Hepburn;J. Bartlett;G. Hardy
中科院分区：
文献类型：
--
作者：
M. Hills;I. Hepburn;J. Bartlett;G. Hardy
我们提出了一种唯象表达式来描述钨的热磁导率，它将零场热导率与低场和高场情况结合起来。其基本形式源自半经典磁阻理论，其拟合参数允许对特定样本进行调整。在 5.5 K 和 0 至 2 T 场中对两种纯度显着不同的钨单晶进行热导率测量。我们发现，通过适当调整拟合参数，该方程在两种情况下都可以很好地拟合数据。讨论了拟合参数的重要性及其值的差异，并描述了它们如何与样本的个体属性相关。结论是，该方程应适用于低于发生轨道量子化的任何场以及从 6 K 到钨超导转变的温度。
We present a phenomenological expression to describe the thermal magnetoconductivity of tungsten which unifies the zero-field thermal conductivity with the low and high-field cases. Its basic form is derived from semi-classical magnetoresistance theory with fitting parameters allowing adjustment to particular samples. Thermal conductivity measurements at 5.5 K and in fields from 0 to 2 T are presented on two single crystals of tungsten with significantly different purities. We find that—with suitable adjustment of the fitting parameters—the equation is an excellent fit to the data in both cases. The significance of the fitting parameters and differences in their values are discussed, and we describe how they can be related to the individual properties of the samples. It is concluded that the equation should be applicable to any field below that at which orbit quantisation occurs and temperatures from 6 K down to tungsten’s superconducting transition.