Multi-Band Calculations on the Upper Critical Fields of Iron Pnictide Superconductor Ba(Fe1-xNix)(2)As-2 (x=0.072)

摘要

Based on two-band Ginzburg-Landau theory, we study the upper critical fields for the overdoped composition of the iron-based superconductor Ba(Fe1-xNix)(2)As-2 with x = 0.072. All the temperature and angular results of this compound are consistent with the experimental data. Thus our analysis strongly suggests that Ba(Fe1-xNix)(2)As-2 in the overdoped regime is a two-gap superconductor.