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Pressure-induced superconductivity in the fcc phase of lithium: Strong-coupling approach

机译：锂FCC相中的压力诱导超导性：强耦合方法

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摘要

The thermodynamic properties of the superconducting state in the fcc phase of lithium for the pressure (p) values 22.3 and 29.7 GPa have been determined by using the semi-phenomenological Eliashberg model. It has been shown, that the critical value of the Coulomb pseudopotential increases with p from 0.22 to 0.36. The values of the dimensionless ratios 2Δ(0)/kBTC and ΔC(TC)/CN(TC) are higher than in the BCS theory and grow together with p. In contrast, the ratio TCCN(TC)/HC2(0) is smaller than in the BCS model and decreases with hydrostatic pressure's increasing. The Superconductors; Thermodynamic properties. numerical results have been supplemented by the analytical formula, which describes the dependence of the critical temperature on p in the considered pressure region.
机译：使用半现象学Eliashberg模型确定了压力（p）值为22.3和29.7 GPa的锂FCC相中超导态的热力学性质。研究表明，库仑赝势的临界值随 p 从 0.22 增加到 0.36。无量纲比值2Δ（0）/kBTC和ΔC（TC）/CN（TC）高于BCS理论，且与p一起增长。相反，TCCN（TC）/HC2（0）比值小于BCS模型，并且随着静水压力的增加而减小。超导体;热力学性质。数值结果由解析公式补充，该公式描述了所考虑的压力区域中临界温度对 p 的依赖性。

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