Scaling of magnetotransport in the Ba(Fe1−x Co x )2As2 series

Abstract

We present magnetotransport studies of the parent, an underdoped and an optimally doped composition of the Ba(Fe1- xCox)(2)As-2 series. We observe that both the Kohler's and modified Kohler's scaling is typically violated in these systems. A notable exception is the magnetically ordered state of the underdoped composition where the modified Kohler's scaling is observed to be valid, indicating its relative similarity to the cuprates and some heavy fermion systems. This composition also exhibits a feature in the Hall angle, which could signify the opening of a pseudogap before the onset of long range magnetic order. The implications of our observations are discussed in the context of magnetotransport of metals with incipient magnetic fluctuations.