Magnetic and superconducting instabilities in a hybrid model of itinerant/localized electrons for iron pnictides

2011/02/20 by Yi-Zhuang You, Yi‐Zhuang You, Fan Yang +2 · 2 citations
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Charge (physics) #Condensed matter physics #Corporate Finance and Governance #Corporate Taxation and Avoidance #Coupling (piping) #Electron #Iron-based superconductors research #Magnetic field #Magnetic moment #Materials science #Phase (matter) #Phase diagram #Physics #Quantum mechanics #Random phase approximation #Scattering #Spin (aerodynamics) #Superconductivity #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.84.054527

published as Phys. Rev. B 84, 054527 (2011) · 11 pages, 8 figures

arxiv created 2011/02/20 · openalex publication_date 2011/08/11 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We study a unified mechanism for spin-density-wave (SDW) and superconductivity in a minimal model in which itinerant electrons and local moments coexist as previously proposed for the iron pnictides [Kou, Li, Weng, EPL 88, 17010 (2009)]. The phase diagram obtained at the mean-field level is in qualitative agreement with the experiment, which shows how the magnetic and superconducting (SC) instabilities are driven by the critical coupling between the itinerant/localized electrons. The spin and charge response functions at the random-phase-approximation level further characterize the dynamical evolution of the system. In particular, the dynamic spin susceptibility displays a Goldstone mode in the SDW phase, which evolves into a gapped resonance-like mode in the SC phase. The latter persists all the way into the normal state above T_c where a strong scattering between the itinerant electrons and local moments is restored, as an essential feature of the model.

Citations

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Cited by

• Calculation of generalized spin stiffness constant of strongly correlated doped quantum antiferromagnet on two-dimensional lattice and it’s application to effective exchange constant for semi-itinerant systems
• Breakdown of Hund's rule for CuFeAs