Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45

Abstract

The complex optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45 with Tc=14K have been examined over a wide frequency range for light polarized in the Fe-Te(Se) planes above and below Tc. At room temperature the optical response may be described by a weakly-interacting Fermi liquid; however, just above Tc this picture breaks down and the scattering rate takes on a linear frequency dependence. Below Tc there is evidence for two gap features in the optical conductivity at Delta_1 ~ 2.5 meV and Delta_2 ~ 5.1 meV. Less than 20% of the free carriers collapse into the condensate for T << Tc, and this material is observed to fall on the universal scaling line for a BCS dirty-limit superconductor in the weak-coupling limit.

arXiv comment6 pages, 6 figures; accepted J. Phys. Chem. Solids, proceedings of SNS2010 in Shanghai (updated references)

References in corpus (63)

• 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${}_x$}
• Superconductivity of metallic boron in MgB_2
• Superconductivity at 22 K in Co-doped BaFe2As2 Crystals
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Boron Isotope Effect in Superconducting MgB${}_2$
• Superconductivity at 27 K in tetragonal FeSe under high pressure
• Magnetism, superconductivity, and pairing symmetry in Fe-based superconductors
• Superconductivity and Phase Diagram in the Iron-based Arsenic-oxides ReFeAsO1-delta (Re = rare earth metal) without F-Doping
• To What Extent Iron-Pnictide New Superconductors Have Been Clarified: A Progress Report
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Superconductivity close to magnetic instability in Fe(Se1-xTex)0.82
• Incommensurate magnetic order in the alpha-Fe(Te,Se) superconductor systems
• Is LaO${}_{1-x}$F${}_x$FeAs an electron-phonon superconductor ?
• Pressure evolution of low-temperature crystal structure and bonding of 37 K $T_c$ FeSe superconductor
• Correlated electronic structure of LaOFeAs
• Superconductivity up to 29 K in SrFe2As2 and BaFe2As2 at high pressures
• A minimal two-band model for the superconducting Fe-pnictides
• Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x
• Electronic correlations in the iron pnictides
• Superconductivity induced by Ni doping in BaFe${}_2$As${}_2$
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• Universal scaling relation in high-temperature superconductors
• The Unprecedented Giant Coupling of Fe-spin State and the As-As Hybridization in Iron-Pnictide
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Spin Gap and Resonance at the Nesting Wavevector in Superconducting FeSe0.4Te0.6
• Strong electron correlations in the normal state of FeSe0.42Te0.58
• Electronic properties of single-crystalline Fe${}_{1.05}$Te and Fe${}_{1.03}$Se${}_{0.30}$Te${}_{0.70}$
• Superconductivity at T_c ~ 14 K in Single Crystalline FeTe${}_{0.61}$Se${}_{0.39}$
• Fermi surface topology and low-lying quasiparticle dynamics of parent Fe${}_{1+x}$Te/Se Superconductor by orbital-polarization resolved ARPES
• Fermi surface topology and low-lying quasiparticle structure of magnetically ordered Fe1+xTe
• Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
• Momentum dependence and nodes of the superconducting gap in iron-pnictides
• Coexistence of incommensurate magnetism and superconductivity in Fe_{1+y}Se_xTe_{1-x}
• Lifting of nodes by disorder in extended-$s$ state superconductors: application to ferropnictides
• Universal Decomposition of the Low-Frequency Conductivity Spectra of Iron-Pnictides Uncovering Fermi-Liquid Behavior
• Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2
• Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties
• Magnetic penetration depth of single crystal SmFeAsO_{1-x}F_y: a fully gapped superconducting state
• Doping Driven ($\pi ,0$) Nesting and Magnetic Properties of Fe${}_{1+x}$Te Superconductors
• Effects of the magnetic orderings on the dynamical conductivity: optical investigations of EuFe${}_2$As${}_2$ single crystals
• Flux growth at ambient pressure of millimeter-sized single crystals of LaFeAsO, LaFeAsO1-xFx, and LaFe1-xCoxAsO
• Evidence for multiple superconducting gaps in optimally doped BaFe${}_{1.87}$Co${}_{0.13}$As${}_2$ from infrared spectroscopy
• Local density of states and superconducting gap in the iron chalcogenide superconductor Fe${}_{1+\delta }$Se${}_{1-x}$Te${}_x$ observed by scanning tunneling spectroscopy
• Scaling of the superfluid density in high-temperature superconductors
• London penetration depth and superfluid density in single crystals of Fe(Te,Se) and Fe(Te,S) superconductors
• Optical spectroscopy of superconducting Ba{0.55}K{0.45}Fe2As2: evidence for strong coupling to low energy bosons
• Electronic correlations and unusual superconducting response in the optical properties of the iron-chalcogenide FeTe0.55Se0.45
• Optical properties of BaFe${}_{2-x}$Co${}_x$As${}_2$
• Unusual Relationship between Magnetism and Superconductivity in FeTe${}_{0.5}$Se${}_{0.5}$
• Short-range incommensurate magnetic order near the superconducting phase boundary in Fe(1+d)Te(1-x)Se(x)
• Direct observation of a nodeless superconducting energy gap in the optical conductivity of iron-pnictides
• Coupling of spin and orbital excitations in the iron-based superconductor FeSe(0.5)Te(0.5)
• Sum rules and electrodynamics of high-Tc cuprates in the pseudogap state
• Muon-spin-spectroscopy study of the penetration depth of FeTe0.5Se0.5
• Multi-gap superconductivity in a BaFe1.84Co0.16As2 film from optical measurements at terahertz frequencies
• Marginal Fermi liquid analysis of 300 K reflectance of Bi2Sr2CaCu2O8+x
• The differential sum rule for the relaxation rate in dirty superconductors
• Superfluid density of Ba(Fe${}_{1-x}{M}_x$)${}_2$As${}_2$ from optical experiments
• The differential sum rule for the relaxation rate in the cuprates
• Sum rule for the optical scattering rates

Cited by in corpus (6)

• Signature of Dispersing 1D Majorana Channels in an Iron-based Superconductor
• Quantum anomalous vortex and Majorana zero mode in iron-based superconductor Fe(Te,Se)
• Optical conductivity of iron-based superconductors
• Macroscopic phase segregation in superconducting K0.73Fe1.67Se2 as seen by muon spin rotation and infrared spectroscopy
• Effective medium approximation and the complex optical properties of the inhomogeneous superconductor K_{0.8}Fe_{2-y}Se_2
• Two-band conductivity of a FeSe${}_{0.5}$Te${}_{0.5}$ film by reflectance measurements in the terahertz and infrared range