Strong-coupling corrections to Bardeen-Cooper-Schrieffer ratios.
Strong-coupling corrections to Bardeen-Cooper-Schrieffer ratios.
复制标题
对 Bardeen-Cooper-Schrieffer 比率的强耦合修正。
DOI：
10.1103/physrevb.33.6141
复制
发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Carbotte
中科院分区：
文献类型：
--
作者：
Marsiglio;Carbotte
我们使用间隙的方井模型，计算了 T/sub c/ 及以下超导 (S) 和正常 (N) 状态之间的归一化比热差以及比率 ..gamma..T/sub c//sup 2//H/sub c//sup 2/(0) 的简单近似表达式。虽然我们的方法非常不同，但获得的公式与文献中已经出现的公式具有相同的一般形式。每个都包含两个参数，我们通过唯象拟合与 Eliashberg 理论的精确数值结果来确定。强耦合变量是 T/sub c//..omega../sub ln/，其中 ..omega../sub ln/ 是平均声子能量的 Allen-Dynes 表达式。
We have calculated simple approximate expressions for the normalized specific-heat difference between superconducting (S) and normal (N) states at and below T/sub c/ and for the ratio ..gamma..T/sub c//sup 2//H/sub c//sup 2/(0), using a square-well model for the gap. While our approach is very different, the formulas obtained have the same general form as those that have already appeared in the literature. Each contains two parameters, which we determine through a phenomenological fit to exact numerical results from Eliashberg theory. The strong-coupling variable is T/sub c//..omega../sub ln/, where ..omega../sub ln/ is the Allen-Dynes expression for the average phonon energy.