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In Fe pnictide (Pn) superconducting materials, neither Mn- nor Cr- doping tothe Fe site induces superconductivity, even though hole carriers are generated.This is in strong contrast with the superconductivity appearing when holes areintroduced by alkali metal substitution on the insulating blocking layers. Weinvestigate in detail the effects of Mn doping on magneto-transport propertiesin Ba(Fe$_{1-x}$Mn$_x$As)$_2$ for elucidating the intrinsic reason. Thenegative Hall coefficient for $x$ = 0 estimated in the low magnetic field ($B$)regime gradually increases as $x$ increases, and its sign changes to a positiveone at $x$ = 0.020. Hall resistivities as well as simultaneous interpretationusing the magnetoconductivity tensor including both longitudinal and transversetransport components clarify that minority holes with high mobility aregenerated by the Mn doping via spin density wave (SDW) transition at lowtemperatures, while original majority electrons and holes residing in theparabolic-like Fermi surfaces (FSs) of the semimetallic Ba(FeAs)$_2$ arenegligibly affected. Present results indicate that the mechanism of hole dopingin Ba(Fe$_{1-x}$Mn$_x$As)$_2$ is greatly different from that of the othersuperconducting FePns family.

Emergence of the minority hole with high mobility on the electrical transport in the Fe-pnictides Ba(Fe$_{1-x}$Mn$_x$As)$_2$