Emergence of high-mobility minority holes in the electrical transport of the Ba(Fe1-x MnxAs)2 iron pnictides

T. Urata, Y. Tanabe, K. K. Huynh, S. Heguri, H. Oguro, K. Watanabe, K. Tanigaki

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In Fe pnictide (Pn) superconducting materials, neither Mn nor Cr doping to the Fe site induces superconductivity, even though hole carriers are generated. This is in strong contrast with the superconductivity appearing when holes are introduced by alkali-metal substitution on the insulating blocking layers. We investigate in detail the effects of Mn doping on magnetotransport properties in Ba(Fe1-xMnxAs)2 for elucidating the intrinsic reason. The negative Hall coefficient for x=0 estimated in the low magnetic field (B) regime gradually increases as x increases, and its sign changes to a positive one at x=0.020. Hall resistivities as well as simultaneous interpretation using the magnetoconductivity tensor including both longitudinal and transverse transport components clarify that minority holes with high mobility are generated by the Mn doping via spin-density wave transition at low temperatures, while original majority electrons and holes residing in the paraboliclike Fermi surfaces of the semimetallic Ba(FeAs)2 are negligibly affected. Present results indicate that the mechanism of hole doping in Ba(Fe1-xMnxAs)2 is greatly different from that of the other superconducting FePn family.

Original languageEnglish
Article number174508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number17
DOIs
Publication statusPublished - 2015 May 11

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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