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We report a systematic study of structural and transport properties in singlecrystals of Ba(Fe_(1-x)Ru_x)_2As_2 for x ranging from 0 to 0.5. The isovalentsubstitution of Fe by Ru leads to an increase of the a parameter and a decreaseof the c parameter, resulting in a strong increase of the AsFeAs angle and adecrease of the As height above the Fe planes. Upon Ru substitution, themagnetic order is progressively suppressed and superconductivity emerges for x> 0.15, with an optimal Tc ~ 20K at x = 0.35 and coexistence of magnetism andsuperconductivity between these two Ru contents. Moreover, the Hall coefficientRH which is always negative and decreases with temperature in BaFe2As2, isfound to increase here with decreasing T and even change sign for x > 0.15. Forx_Ru = 0.35, photo-emission studies have shown that the number of holes andelectrons are similar with n_e = n_h ~ 0.11, that is twice larger than found inBaFe2As2 [1]. Using this estimate, we find that the transport properties ofBa(Fe_0.65Ru_0.35)_2As_2 can be accounted for by the conventional multibanddescription for a compensated semi-metal. In particular, our results show thatthe mobility of holes is strongly enhanced upon Ru addition and overcomes thatof electrons at low temperature when x_Ru > 0.15.

Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals