Multi-Band Calculations on the Upper Critical Fields of Iron Pnictide Superconductor Ba(Fe1-xNix)2As2 (x=0.072)

Hai Huanga,b, Peng-Li Lv a, Wei-Feng Li a and Peng Liu a aDepartment of Mathematics and Physics, North China Electric Power University, Beijing 102206, China bState Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China

Received: March 31, 2014; In final form: January 20, 2015

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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)2As2 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)2As2 in the overdoped regime is a two-gap superconductor.

DOI: 10.12693/APhysPolA.127.799 PACS numbers: 74.25.Ha