Analysis of Electronic Properties from Magnetotransport Measurements on Ba(Fe(1−x)Ni(x))(2)As(2) Thin Films

We performed a detailed structural, magnetotransport, and superconducting analysis of thin epitaxial Ba(Fe(1−x)Ni(x))(2)As(2) films with Ni doping of x = 0.05 and 0.08, as prepared by pulsed laser deposition. X-ray diffraction studies demonstrate the high crystalline perfection of the films, which have a similar quality to single crystals. Furthermore, magnetotransport measurements of the films were performed in magnetic fields up to 9 T. The results we used to estimate the density of electronic states at the Fermi level, the coefficient of electronic heat capacity, and other electronic parameters for this compound, in their dependence on the dopant concentration within the framework of the Ginzburg–Landau–Abrikosov–Gorkov theory. The comparison of the determined parameters with measurement data on comparable Ba(Fe(1−x)Ni(x))(2)As(2) single crystals shows good agreement, which confirms the high quality of the obtained films.