Mathematical and Physical Properties of Three-Band <i>s</i>± Eliashberg Theory for Iron Pnictides

Abstract

The phenomenology of the iron pnictide superconductor can be described by the three-band s± Eliashberg theory in which the mechanism of superconducting coupling is mediated by antiferromagnetic spin fluctuations and whose characteristic energy Ω0 scales with Tc according to the empirical law Ω0=4.65kBTc. This model presents the universal characteristics that are independent of the critical temperature, such as the link between the two free parameters λ13 and λ23 and the ratio Δi/kBTc.

Keywords

• antiferromagnetic spin fluctuations
• superconducting materials
• Fe-based superconductors
• multiband Eliashberg theory