Signatures of Electronic Correlations in Optical Properties of LaFeAsO${}_{1-x}$F${}_x$

Abstract

Spectroscopic ellipsometry is used to determine the dielectric function of the superconducting LaFeAsO${}_{0.9}$F${}_{0.1}$ ($T_c$ = 27 K) and undoped LaFeAsO polycrystalline samples in the wide range 0.01-6.5 eV at temperatures 10 $\le T\le$ 350 K. The free charge carrier response in both samples is heavily damped with the effective carrier density as low as 0.040$\pm$0.005 electrons per unit cell. The spectral weight transfer in the undoped LaFeAsO associated with opening of the pseudogap at about 0.65 eV is restricted at energies below 2 eV. The spectra of superconducting LaFeAsO${}_{0.9}$F${}_{0.1}$ reveal a significant transfer of the spectral weight to a broad optical band above 4 eV with increasing temperature. Our data may imply that the electronic states near the Fermi surface are strongly renormalized due to electron-phonon and/or electron-electron interactions.

arXiv comment4 pages, 4 figures, units in Fig.2 added

References in corpus (15)

• Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
• Magnetic Order versus superconductivity in the Iron-based layered La(O1-xFx)FeAs systems
• Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsO${}_{1-x}$F${}_x$}
• LaFeAsO${}_{1-x}$F${}_x$: A low carrier density superconductor near itinerant magnetism
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Very High Field Two-Band Superconductivity in LaFeAsO_0.89F_0.11
• Correlated electronic structure of LaOFeAs
• Electron-Hole Symmetry and Magnetic Coupling in Antiferromagnetic LaOFeAs
• Strongly Correlated Superconductivity: a plaquette Dynamical mean field theory study
• Spin-controlled Mott-Hubbard bands in LaMnO_3 probed by optical ellipsometry
• Superconducting properties of Fe-based layered superconductor LaO${}_{0.9}$F${}_{0.1-\delta }$FeAs
• Optical conductivity and the correlation strength of high temperature copper-oxide superconductors
• In-Plane Spectral Weight Shift of Charge Carriers in $YB{a}_{2}C{u}_3{O}_{6.9}$
• Temperature dependence of the optical spectral weight in the cuprates: Role of electron correlations
• Superconducting energy gap and c-axis plasma frequency of (Nd,Sm)O0.82F0.18FeAs superconductors from infrared ellipsometry

Cited by in corpus (47)

• Comparison of Ab initio Low-Energy Models for LaFePO, LaFeAsO, BaFe2As2, LiFeAs, FeSe and FeTe: Electron Correlation and Covalency
• Strongly Correlated Materials
• Iron pnictides as a new setting for quantum criticality
• Electronic Structure Calculation by First Principles for Strongly Correlated Electron Systems
• Band Narrowing and Mott Localization in Iron Oxychalcogenides La2O2Fe2O(Se,S)2
• On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
• Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides
• Properties of a two orbital model for oxypnictide superconductors: Magnetic order, B_2g spin-singlet pairing channel, and its nodal structure
• Optical properties of correlated materials -- Generalized Peierls approach and its application to VO2
• Quantum criticality in the iron pnictides and chalcogenides
• Mott transition in Modulated Lattices and Parent Insulator of (K,Tl)yFexSe2 Superconductors
• First-principles calculation of transition-metal impurities in LaFeAsO
• Ab initio Evidence for Strong Correlation Associated with Mott Proximity in Iron-based Superconductors
• Mott Transition in Multi-Orbital Models for Iron Pnictides
• Eliashberg approach to superconductivity-induced infrared anomalies in Ba0.68K0.32Fe2As2
• Correlation effects in the iron pnictides
• Quasiparticle relaxation dynamics in spin-density-wave and superconducting SmFeAsO_{1-x}F_{x} single crystals
• Electron-phonon coupling and charge gap in spin-density-wave iron-pnictides from quasiparticle relaxation dynamics
• Iron pnictide superconductors: Electrons on the verge
• Spin Dynamics of a J1-J2-K Model for the Paramagnetic Phase of Iron Pnictides
• Optical and Raman spectroscopy studies on Fe-based superconductors
• Optical conductivity and Raman scattering of iron superconductors
• Theory of Multiband Superconductivity in Iron Pnictides
• Optical conductivity of iron-based superconductors
• Optical spectroscopy study on single crystalline LaFeAsO
• Optical conductivity of superconducting Rb2Fe4Se5
• Superconductivity in Multi-orbital t-J1-J2 Model and its Implications for Iron Pnictides
• Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides
• The magnetic phase diagram of an extended J1-J2 model on a modulated square lattice and its implications for the antiferromagnetic phase of KyFexSe2
• Modeling Antiferromagnetic Phase in Iron Pnictides: Weakly Ordered State
• Anomalous dependence of the c-axis polarized Fe B${}_{1g}$ phonon mode with Fe and Se concentrations in Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Spin Dynamics of a $J_1-J_2$ Antiferromagnet and its Implications for Iron Pnictides
• Spin-density-wave-induced anomalies in the optical conductivity of AFe2As2, (A=Ca, Sr, Ba) single-crystalline iron pnictides
• Surface transport properties of Fe-based superconductors: The influence of degradation and inhomogeneity
• Orbital-dependent effects of electron correlations in microscopic models for iron-based superconductors
• Optical Conductivity Anisotropy in the Undoped Three-Orbital Hubbard Model for the Pnictides
• Optical study on the spin-density wave properties in single crystalline Na${}_{1-\delta }$FeAs
• Ising-nematic order in the bilinear-biquadratic model for the iron pnictides
• Evidence of a full gap in LaFeAsO${}_{1-x}$F${}_x$ thin films from infrared spectroscopy
• Localization Phenomena in Disordered Tantalum Films
• High superconducting anisotropy and weak vortex pinning in Co doped LaFeAsO
• Localization effects in the disordered Ta interlayer of multilayer Ta-FeNi films: Evidence from dc transport and spectroscopic ellipsometry study
• Electron Correlation and Spin Dynamics in Iron Pnictides and Chalcogenides
• Intrinsic charge dynamics in high-Tc AFeAs(O,F) superconductors
• The Hidden Nematic Fluctuations in the Triclinic (Ca0.85La0.15)10(Pt3As8)(Fe2As2)5 Superconductor Revealed by Ultrafast Optical Spectroscopy
• Theory of Magnetic Fluctuations in Iron Pnictides
• Resonant inelastic x-ray scattering in single-crystal superconducting PrFeAsO0.7