SUPERCONDUCTIVITY IN NIOBIUM AND NIOBIUM--TANTALUM ALLOYS.
SUPERCONDUCTIVITY IN NIOBIUM AND NIOBIUM--TANTALUM ALLOYS.
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铌和铌-钽合金的超导性。
DOI：
10.1016/0022-3697(69)90283-2
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发表时间：
1969
影响因子：
4
通讯作者：
T. Mizusaki
中科院分区：
文献类型：
--
作者：
A. Ikushima;T. Mizusaki
从超导Nb和富Nb Nb-Ta合金的磁化强度测量中发现，纯Nb中上临界场和两个Ginzburg-Landau参数随温度变化的实验与理论的差异与超导能隙的各向异性有关，而与其非弱耦合性质无关。从测量中推导出几个电子参数。电子比热的温度系数γ随Ta浓度的变化在Ta的几个原子百分比处有一个峰值，而当Ta加入时，超导转变温度从纯Nb的9.23°K迅速下降。对Nb中载流子浓度的估计表明，正常状态下的所有载流子可能在足够低的温度下进入超导状态。
From magnetization measurements in superconducting Nb and Nb-rich Nb-Ta alloys, it was found that the discrepancies between experiment and theory in the upper critical field and two Ginzburg-Landau parameters as a function of temperature in pure Nb are directly related to the anisotropy of the superconducting energy gap, and not to its non-weak coupling nature.Besides the above-mentioned conclusion, several electronic parameters were deduced from the measurements. The temperature coefficient of the electronic specific heat, γ, as a function of Ta concentration has a peak at several atomic per cent of Ta, whereas the superconducting transition temperature drops very rapidly from 9.23°K for pure Nb as Ta is added. An estimation of the carrier concentration in Nb showed that all carriers in the normal state probably go into the superconducting state at sufficiently low temperatures.