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We report magnetotransport measurements and its scaling analysis for theoptimally electron doped Sr(Fe${_{0.88}}$Co${_{0.12}}$)${_2}$As${_2}$ system.We pbserve that both the Kohler's and modified Kohler's scalings are violated.Interestingly, the Hall angle displays a quadratic temperature dependencesimilar to many cuprates and heavy fermion systems. The fact that thistemperature dependence is seen in spite of the violation of modified Kohler'sscaling suggests that the Hall angle and the magnetoresistance are not governedby the same scattering mechanism. We also observe a linear magnetoresistance inthis system, which does not harbor a spin density wave ground state.Implcations of our observations are discussed in the context of spinfluctuations in strongly correlated electron systems.

Magnetotransport studies of optimally doped Sr(Fe${_{1-x}}$Co${_x}$)${_2}$As${_2}$