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The electronic states and superconductivity in iron pnictides are studied onthe basis of the 16 band $d$-$p$ model which includes both the onsite Coulombinteraction between Fe $d$ electrons and the intersite one between Fe $d$ andpnictogen $p$ electrons. The model well accounts for experimentally observedtwo fluctuations: the $d$-$d$ interaction-enhanced antiferromagnetic (AFM)fluctuation and the $d$-$p$ interaction-enhanced ferro-orbital (FO) fluctuationresponsible for the $C_{66}$ elastic softening. The AFM fluctuation induces therepulsive pairing interaction for $\bm{q}\sim \bm{Q}_{\rm AF}$ while the FOdoes the attractive one for $\bm{q}\sim \bm{0}$ resulting in the $s_{\pm}$-wavesuperconductivity where the two fluctuations cooperatively enhance thesuperconducting transition temperature $T_{c}$ without any competition byvirtue of the $\bm{q}$-space segregation.

A High-Tc Mechanism of Iron Pnictide Superconductivity due to Cooperation of Ferro-orbital and Antiferromagnetic Fluctuations