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Double exchange mechanism is believed to favor transport along ferromagneticdirections, the failure of which in explaining the unusual resistivityanisotropy in iron pnictides is investigated. Several factors intrinsic to themicroscopic mechanism of transport in iron pnictides are identified andanalyzed, including the moderate Hund's coupling, low local moment, andpresence of two anisotropic degenerate orbitals xz and yz. In particular, thesubstantial second neighbor hoppings are found to be decisive in giving resultsopposite to the double exchange picture. In high temperature nonmagnetic phase,orbital ordering is shown to give the right trend of resistivity anisotropy asobserved experimentally, advocating its essential role in electron transport ofiron pnictides.

Impairment of double exchange mechanism in electron transport of iron pnictides