Two-Fluid Description for Iron-Based Superconductors

Abstract

We present a two-fluid description for iron-based superconductors, which contains an itinerant electron Fermi-liquid and a local moment spin-liquid, coupled together via an effective Hund's rule interaction. We examine the low-energy collective behavior of such a system. We find that an electron-spinon composite mode emerges in the intermediate coupling regime, which may account for the hump-dip behavior observed in the resent scanning tunneling spectroscopy experiments. The superconductivity and spin-density-wave phases are consistently described within the same framework. Possible experimental test is also proposed.

18 pages + references, 16 figures

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Cited by in corpus (7)

• Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors
• Schwinger boson spin liquid states on square lattice
• Spin-Orbital-Intertwined Nematic State in FeSe
• Breakdown of single spin-fluid model in heavily hole-doped superconductor CsFe2As2
• High-Energy Damping by Particle-Hole Excitations in the Spin-Wave Spectrum of Iron-Based Superconductors
• Stronger quantum fluctuation with larger spins: Emergent magnetism in the pressurized high-temperature superconductor FeSe
• Electronic and spin dynamics in the insulating iron pnictide NaFe${}_{0.5}$Cu${}_{0.5}$As