Probing superconducting energy gap from infrared spectroscopy on a Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K

Abstract

We performed optical spectroscopy measurement on a superconducting Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K. Formation of the superconducting energy gaps in the far-infared reflectance spectra below T${}_c$ is clearly observed. The gap amplitudes match well with the two distinct superconducting gaps observed in angle-resolved photoemission spectroscopy experiments on different Fermi surfaces. We determined absolute value of the penetration depth at 10 K as $\lambda \simeq 2000\mathring{A}$. A spectral weight analysis shows that the Ferrell-Glover-Timkham sum rule is satisfied at low energy scale, less than 6$\Delta$.

4 pages, 5 figures

References in corpus (10)

• Superconductivity at 43 K in Samarium-arsenide Oxides $SmFeAs{O}_{1-x}{F}_x$
• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
• Superconductivity in iron-based F-doped layered quaternary compound Nd[O1-xFx]FeAs
• Anisotropic thermodynamic and transport properties of single crystalline (Ba${}_{1-x}$K${}_x$)Fe${}_2$As${}_2$ (x = 0 and 0.45)
• Scaling of the superfluid density in high-temperature superconductors
• Sum rules and energy scales in the high-temperature superconductor YBa2Cu3O6+x
• Low-energy electrodynamics of superconducting diamond
• Optical determination of the superconducting energy gap in electron-doped Pr_{1.85}Ce_{0.15}CuO_4
• Sub-THz electrodynamics of the graphene-like superconductor CaAlSi

Cited by in corpus (45)

• Electrodynamics of Correlated Electron Materials
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• Origin of the spin density wave instability in AFe${}_2$As${}_2$ (A=Ba, Sr) as revealed by optical spectroscopy
• High - Temperature Superconductivity in Iron Based Layered Compounds
• Anisotropic itinerant magnetism and spin fluctuations in BaFe2As2: A neutron scattering study
• Superconductivity at 32K and anisotropy in Tl0.58Rb0.42Fe1.72Se2 crystals
• Use of X-ray scattering functions in Kramers-Kronig analysis of reflectance
• Evolution of the optical spectrum with doping in iron pnictides Ba(Fe1-xCox)2As2
• Momentum-resolved superconducting gap in the bulk of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ from combined ARPES and $\mu$SR measurements
• Evidence for Two Gaps and Breakdown of the Uemura Plot in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Single Crystals
• Crossover from weak to strong pairing in unconventional superconductors
• Electrodynamics of electron doped iron-pnictide superconductors: Normal state properties
• Homogeneous vs. inhomogeneous coexistence of magnetic order and superconductivity probed by NMR in Co and K doped iron pnictides
• Observation of the Josephson effect in Pb/(Ba,K)Fe2As2 single crystal junctions
• Ultrafast transient response and electron-phonon coupling in the iron-pnictide superconductor Ba(Fe(1-x)Co(x))2As2
• Non-exponential London penetration depth in Ba${}_{1-}$K${}_x$Fe${}_2$As${}_2$ single crystals
• Optical properties of the iron-arsenic superconductor BaFe1.85Co0.15As2
• Coexistence and competition of magnetism and superconductivity on the nanometer scale in underdoped BaFe1.89Co0.11As2
• Superconducting Properties of the $s^{\pm }$-wave state: Fe-based superconductors
• Point-contact Andreev-reflection spectroscopy in ReFeAsO_{1-x}F_x (Re = La, Sm): Possible evidence for two nodeless gaps
• Superconductivity-induced optical anomaly in an iron arsenide
• Optical conductivity of iron-based superconductors
• Effects of electron irradiation on resistivity and London penetration depth of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ ($x\le$ 0.34) iron - pnictide superconductor
• Multiple Gaps and Superfluid Density from Interband Pairing in Iron Oxypnictides
• Optical signature of sub-gap absorption in the superconducting state of Ba(Fe,Co)2As2
• Josephson effect between electron-doped and hole-doped iron pnictide single crystals
• Transport and infrared properties of SmFeAs(O1-xFx): from SDW to superconducting ordering
• Competition between superconductivity and magnetic/nematic order as a source of anisotropic superconducting gap in underdoped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range
• Band-selective clean- and dirty-limit superconductivity with nodeless gaps in the bilayer iron-based superconductor CsCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Superconductivity and electronic fluctuations in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by Raman scattering
• Vortex state in iron-based superconductors with collinear antiferromagnetic cores
• Superconductivity emerging from an electronic phase separation in the charge ordered phase of RbFe${}_2$As${}_2$
• Evolution of London penetration depth with scattering in single crystals of K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$
• Optical properties of the iron-pnictide analog BaMn2As2
• Charge and nematic orders in AFe${}_2$As${}_2$ (A= Rb,Cs) superconductors
• Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Acoustic and optical phonon dynamics from femtosecond time-resolved optical spectroscopy of superconducting iron pnictide Ca(Fe_0.944Co_0.056)_2As_2
• Optical observation of spin-density-wave fluctuations in Ba122 iron-based superconductors
• Infrared probe of the gap evolution across the phase diagram of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Emergence of Superconductivity from Fully Incoherent Normal State in an Iron-Based Superconductor (Ba${}_{0.6}$K${}_{0.4}$)Fe${}_2$As${}_2$
• Ultrafast quasiparticle dynamics in superconducting iron pnictide CaFe1.89Co0.11As2
• Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
• Strong electron-boson coupling in the iron-based superconductor BaFe1.9Pt0.1As2 revealed by infrared spectroscopy