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We report a systematic investigation, together with a theoretical analysis,of the resistivity and Hall effect in single crystals ofBa(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$, over a wide doping range. We find asurprisingly great disparity between the relaxation rates of the holes and theelectrons, in excess of an order of magnitude in the low-doping,low-temperature regime. The ratio of the electron to hole mobilities diminisheswith temperature and doping (away from the magnetically ordered state) andbecomes more conventional. We also find a straightforward explanation of thelarge asymmetry (compared to cuprates) of the superconducting dome: in theunderdoped regime the decisive factor is the competition between AF andsuperconductivity (SC), while in the overdoped regime the main role is playedby degradation of the nesting that weakens the pairing interaction. Our resultsindicate that spin-fluctuations due to interband electron-hole scattering playa crucial role not only in the superconducting pairing, but also in the normaltransport.

Role of multiband effects and electron-hole asymmetry in the superconductivity and normal state properties of Ba(Fe$_{1-x}$Co$_{x}$)$_{2}$As$_{2}$