title: Modeling the antiferromagnetic phase in iron pnictides: weakly ordered state.
abstract: We examine electronic states of antiferromagnetic phase in iron pnictides by mean-field calculations of the optical conductivity. We find that a five-band model exhibiting a small magnetic moment, inconsistent with the first-principles calculations, reproduces well the excitation spectra characterized by a multipeak structure emerging below the Néel temperature at low energy, together with an almost temperature-independent structure at high energy. Investigating the interlayer magnetoresistance for this model, we also predict its characteristic field dependence reflecting the Fermi surface.
authors.affiliation: Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Kaneshita
authors.forename: T
authors.initials: T
authors.lastname: Morinari
authors.forename: T
authors.initials: T
authors.lastname: Tohyama