Analysis of experimental data for two-band superconductors at T approximate to T-c using the GL theory in the presence of a self-consistent vortex line

作者：Macias M Alfredo; Rodriguez Nunez J J; Bonalde Ismardo; Schmidt A A

来源：International Journal of Modern Physics B, 2015, 29(21): 1550150.

DOI：10.1142/S0217979215501507

• Ginzburg-Landau equations of two-bands
• order parameters
• penetration depth
• bulk coherent length
• critical temperatures

We study the two-component Ginzburg-Landau (GL) theory, in the presence of a self-consistent vortex line, to obtain the penetration depth (lambda) and the effective healing length (xi), in the asymptotic limit r ->infinity. All these parameters versus T/T-c are analyzed for the materials MgB2, V3Si and LiFeAs in the interval 0.88 <= T/T-c <= 1.0, where the GL theory is assumed to be valid. We find that kappa = lambda/xi, which is another parameter not related to the GL parameter, is T-independent for V3Si and LiFeAs, while is T-dependent for the compound MgB2. This result suggests that even though all these three materials display two-gap superconductivity overall, near T-c superconductivity in V3Si and LiFeAs seems to be different from the one in MgB2. The use of this parameter, kappa, as a new way to "study" the superconducting materials, under the presence of a single vortex, is valid for 0.

• 出版日期2015-8-20