Strong coupling to magnetic fluctuations in the charge dynamics of Fe-based superconductors

Abstract

We present a comprehensive comparison of the infrared charge response of two systems, characteristic of classes of the 122 pnictide (SrFe2As2) and 11 chalcogenide (Fe_1.087Te) Fe compounds with magnetically-ordered ground states. In the 122 system, the magnetic phase shows a decreased plasma frequency and scattering, and associated appearance of strong mid-infrared features. The 11 system, with a different magnetic ordering pattern, also shows decreased scattering, but an increase in the plasma frequency, while no clear mid-infrared features appear below the ordering temperature. We suggest how this marked contrast can be understood in terms of the diverse magnetic ordering patterns of the ground state, and conclude that while the high temperature phases of these systems are similar, the magnetic ordering strongly affects the charge dynamical response. In addition, we propose an optical absorption mechanism which appears to be consistent with information gained from several different experiments.

4 pages, 4 figures

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Cited by in corpus (16)

• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Normal-state charge dynamics in doped BaFe2As2: Roles of doping and necessary ingredients for superconductivity
• High energy pseudogap and its evolution with doping in Fe-based superconductors as revealed by optical spectroscopy
• Nature of the bad metallic behavior of Fe_{1.06}Te inferred from its evolution in the magnetic state
• Macroscopic phase segregation in superconducting K0.73Fe1.67Se2 as seen by muon spin rotation and infrared spectroscopy
• Evidence for core-hole-mediated inelastic x-ray scattering from metallic Fe${}_{1.087}$Te
• Phonon anomalies in some iron-telluride materials
• Correlation, doping and interband effects on the optical conductivity of iron superconductors
• Magnetism and superconductivity in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Spectral weight transfer in strongly correlated Fe${}_{1.03}$Te
• Temperature-induced Change in the Fermi Surface Topology in the Spin Density Wave Phase of Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Ultralow-dissipative conductivity by Dirac fermions in BaFe${}_2$As${}_2$
• Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr${}_{0.67}$Na${}_{0.33}$Fe${}_2$As${}_2$
• Pressure suppression of spin-density-wave gap in the optical conductivity of SrFe2As2
• Scanning Tunneling Spectroscopy on SrFe${}_2$(As${}_{1-\mathrm{x}}$P${}_{\mathrm{x}}$)${}_2$
• Optical study of the antiferromagnetic ordered state in electron-overdoped Ca0.77Nd0.23FeAs2