cond-mat.supr-con
Optical and transport properties of Ba(Fe$_{1-x}$Ni$_x$)$_2$As$_2$ films
Yurii A. Aleshchenko Andrey V. Muratov Elena S. Zhukova Lenar S. Kadyrov Boris P. Gorshunov Giovanni A. Ummarino Ilya A. Shipulin