论文标题
铝从超导到正常状态的一阶相变的理论描述，通过电流密度的功能理论
Theoretical description of the first-order phase transition of aluminum from a superconducting to normal state by the current-density functional theory for superconductors
论文作者
论文摘要
我们表明，超导体（SC-CDFT）的电流密度功能理论可以描述磁场诱导的铝从超导状态到正常状态的铝的一阶相变。这是通过引入超导电子之间有吸引力相互作用的磁场依赖模型来实现的。该模型指出，穿透磁场产生的表面电势会导致吸引人相互作用的磁场依赖性。具体而言，由于表面电势孔，表面附近的电子密度随磁场的增加而增加，这导致由于筛查效果而引起的有吸引力的相互作用的减少。我们还开发了解决SC-CDFT的间隙方程的计算方案，并考虑到有吸引力相互作用的磁场依赖性。结果表明，超导间隙的磁场依赖性的计算结果与一阶相变的实验结果非常吻合。
We show that the current-density functional theory for superconductors (sc-CDFT) can describe the magnetic-field-induced first-order phase transition of aluminum from a superconducting state to a normal state. This is accomplished by introducing a model for the magnetic field dependence of the attractive interaction between superconducting electrons. This model states that the surface potential well produced by the penetrating magnetic field leads to the magnetic field dependence of the attractive interaction. Specifically, the electron density near the surface increases with the magnetic field due to the surface potential well, which causes the reduction in the attractive interaction due to the screening effect. We also develop the calculation scheme to solve the gap equation of the sc-CDFT with taking into account the magnetic field dependence of the attractive interaction. It is shown that calculation results of the magnetic field dependence of the superconducting gap are in good agreement with experimental results of the first-order phase transition.
