Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2

Abstract

The recent discovery of superconductivity in iron-arsenic compounds below a transition temperature (Tc) as high as 55K ended the monopoly of copper oxides (cuprates) in the family of high-Tc superconductors. A critical issue in understanding this new superconductor, as in the case of cuprates, is the nature, in particular the symmetry and orbital dependence, of the superconducting gap. There are conflicting experimental results, mostly from indirect measurements of the low energy excitation gap, ranging from one gap to two gaps, from line nodes to nodeless gap function in momentum space. Here we report a direct observation of the superconducting gap, including its momentum, temperature, and Fermi surface (FS) dependence in Ba0.6K0.4Fe2As2 (Tc = 37 K) using angle-resolved photoelectron spectroscopy. We find two superconducting gaps with different values: a large gap (~ 12 meV) on the two small hole-like and electron-like FS sheets, and a small gap (~ 6 meV) on the large hole-like FS. Both gaps, closing simultaneously at the bulk Tc, are nodeless and nearly isotropic around their respective FS sheets. The isotropic pairing interactions are strongly orbital dependent, as the ratio 2Delta/kBTc switches from weak to strong coupling on different bands. The same and surprisingly large superconducting gap due to strong pairing on the two small FS, which are connected by the (pi, 0) spin-density-wave vector in the parent compound, strongly suggests that the pairing mechanism originates from the inter-band interactions between these two nested FS sheets.

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• Distinguishing between $s+id$ and $s+is$ pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect
• Anisotropy of strong pinning in multi-band superconductors
• Optical conductivity of iron-based superconductors
• s+is superconductivity with incipient bands: doping dependence and STM signatures
• Electronic band structure of ferro-pnictide superconductors from ARPES experiment
• Multiple Gaps and Superfluid Density from Interband Pairing in Iron Oxypnictides
• Electronic Structure of Superconducting FeSe Studied by High-Resolution Photoemission Spectroscopy
• Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
• Resonance as a probe of the electron superconducting gap in BaFe1.9Ni0.1As2
• Local quasiparticle density of states of superconducting SmFeAsO$1-x$F$x$ single crystals: Evidence for spin-mediated pairing
• Upper critical field and thermally activated flux flow in single crystalline Tl${}_{0.58}$Rb${}_{0.42}$Fe${}_{1.72}$Se${}_2$
• Electron correlation and spin density wave order in iron pnictides
• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Theory of thermal conductivity in extended-$s$ state superconductors: application to ferropnictides
• Itinerancy enhanced quantum fluctuation of magnetic moments in iron-based superconductors
• Manipulation of gap nodes by uniaxial strain in iron-based superconductors
• Multiband Superconductivity in KFe2As2: Evidence for one Isotropic and several Liliputian Energy Gaps
• Using electron irradiation to probe iron - based superconductors
• Microwave Surface Impedance Measurements of LiFeAs Single Crystals
• Thermoelectric Signatures of Time-Reversal Symmetry Breaking States in Multiband Superconductors
• Full Gap Superconductivity in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Probed by Muon Spin Rotation
• Theory of fluctuation conductivity from interband pairing in pnictide superconductors
• Heat capacity jump at Tc and pressure derivatives of superconducting transition temperature in the Ba1-xKxFe2As2 (0.2 < x < 1.0) series
• Magnetic and superconducting transitions in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ studied by specific heat
• The electronic specific heat of Ba1-xKxFe2As2 (x=0 to 1.0) from 2K to 380K
• Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2
• Ambegaokar-Baratoff relations of Josephson critical current in heterojunctions with multi-gap superconductors
• High-field phase-diagram of Fe arsenide superconductors
• Superconductivity in Multi-orbital t-J1-J2 Model and its Implications for Iron Pnictides
• Spectroscopic Evidence of Bilayer Splitting and Interlayer Pairing in an Iron Based Superconductor
• Structural, Magnetic and Electronic Properties of the Iron-Chalcogenide A${}_x$Fe${}_{2-y}$Se${}_2$ (A=K, Cs, Rb, Tl and etc.) Superconductors
• Orbital fluctuation mechanism for superconductivity in iron-based compounds
• Anisotropic vortex lattice structures in the FeSe superconductor
• Interplay of Superconductivity and Fermi-Liquid Transport in Rh-Doped CaFe2As2 with Lattice-Collapse Transition
• Vortex states in hole-doped iron-pnictide superconductors
• Fermi surface topology and low-lying electronic structure of a new iron-based superconductor Ca10(Pt3As8)(Fe2As2)5
• Heat transport in RbFe2As2 single crystal: evidence for nodal superconducting gap
• Electronic band structure and momentum dependence of the superconducting gap in (Ca, Na)Fe2As2 from angle-resolved photoemission spectroscopy
• Why $T_c$ of (CaFeAs)${}_{10}$Pt${}_{3.58}$As${}_8$ is twice as high as (CaFe${}_{0.95}$Pt${}_{0.05}$As)${}_{10}$Pt${}_3$As${}_8$
• High-temperature superconductivity from fine-tuning of Fermi-surface singularities in iron oxypnictides
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• Neutron spin resonance in the 112-type iron-based superconductor
• Superconducting fluctuations in the reversible magnetization of the iron-pnictide $B{a}_{1-x}{K}_{x}F{e}_{2}A{s}_2$
• Nonequilibrium Quasiparticle Relaxation Dynamics in Single Crystals of Hole and Electron doped BaFe${}_2$As${}_2$
• Probing the pairing symmetry of the iron pnictides with electronic Raman scattering
• The superconductor KxSr(1-x)Fe2As2: Normal state and superconducting properties
• Transport and infrared properties of SmFeAs(O1-xFx): from SDW to superconducting ordering
• Investigation of Superconducting Gap Structure in TbFeAsO${}_{0.9}$F${}_{0.1}$ using Point Contact Andreev Reflection
• Crossover in the magnetic response of single-crystalline Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$ and Lifshitz critical point evidenced by Hall effect measurements
• S-wave superconductivity with orbital dependent sign change in the checkerboard models of iron-based superconductors
• Spin-Density-Wave and Asymmetry of Coherence Peaks in iron-Pnictide Superconductors from a two-orbital model
• Nodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Lower Critical Field, Anisotropy, and Two-Gap Features of LiFeAs
• Orbital mismatch boosting nematic instability in iron-based superconductors
• Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li1-xFeAs
• Perturbation Theory of High-Tc Superconductivity in Iron Pnictides
• Strong in-plane magnetic field induced reemergent superconductivity in the van der Waals heterointerface of NbSe2 and CrCl3
• Effective carrier type and field-dependence of the reduced-Tc superconducting state in SrFe(2-x)Ni(x)As2
• Microscopically derived multi-component Ginzburg-Landau theories for $s+is$ superconducting state
• Superconducting electronic state in optimally doped YBa2Cu3O7-d observed with laser-excited angle-resolved photoemission spectroscopy
• High Pressure Synthesis of Indirectly electron-doped 122 Iron Superconductor Sr1-xLaxFe2As2 with a maximum Tc = 22 K
• Magnetic Properties of the Superconducting State of Iron-Based Superconductors
• Vortex images on Ba{1-x}KxFe2As2 observed directly by the magnetic force microscopy
• Interface energy of two band superconductors
• Bulk electronic structure of optimally doped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• When superconductivity does not fear magnetism: Insight into electronic structure of RbEuFe${}_4$As${}_4$
• Point-contact spectroscopic studies on normal and superconducting AFe_2As_2-type iron-pnictide single crystals
• Cross-band versus intra-band pairing in superconductors: signatures and consequences of the interplay
• Nodeless superconducting gap in electron-doped BaFe${}_{1.9}$Ni${}_{0.1}$As${}_2$ probed by quasiparticle heat transport
• Multigap nodeless superconductivity in CsCa2Fe4As4F2 probed by heat transport
• Anisotropic Superconductivity of Ca1-xLaxFeAs2 (x ~ 0.18) Single Crystal
• Nodal gap in iron-based superconductor CsFe${}_2$As${}_2$ probed by quasiparticle heat transport
• Precision Microwave Electrodynamic Measurements of K- and Co-doped BaFe${}_2$As${}_2$
• Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2
• Influence of $s_{\pm }$ symmetry on unconventional superconductivity in pnictides above the Pauli limit -- two-band model study
• Multiple-gap response of type-I noncentrosymmetric BeAu superconductor
• Identification of prototypical Brinkman-Rice Mott physics in a class of iron chalcogenides superconductors
• Nodes in the Order Parameter of Superconducting Iron Pnictides Observed by Infrared Spectroscopy
• 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
• Self-energy effects and electron-phonon coupling in Fe-As superconductors
• Anomalous impurity effects in the iron-based superconductor KFe${}_2$As${}_2$
• Temperature dependence and resonance effects in Raman scattering of phonons in NdFeAsO${}_x$F${}_{1-x}$ single crystals
• Small-q Phonon Mediated Unconventional Superconductivity in the Iron Pnictides
• Systematic ^{75}As NMR study of the dependence of low-lying excitations on F doping in the iron oxypnictide LaFeAs(O_{1-x}F_{x})
• 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
• Extended Hubbard model of superconductivity driven by charge fluctuations in iron-pnictides
• Quasiparticle states around a nonmagnetic impurity in electron-doped iron-based superconductors with spin-density-wave order
• Phase-incoherent superconducting pairs in the normal state of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Valence band and core level photoemission spectros-copy of LaFeAsO${}_{1-x}$F${}_x$
• Angle-resolved photoemission spectroscopy study of PrFeAsO_{0.7}: Dependence of the electronic structure on the pnictogen height
• Novel Superconducting Characteristics and Unusual Normal-State Properties in Iron-based Pnictide Superconductors: 57Fe-NMR and 75As-NQR/NMR studies in REFeAsO_1-y (RE=La,Pr,Nd) and Ba0.6K0.4Fe2As2
• Magnetic impurities in the two-band $s_{\pm }$-wave superconductors
• Competition/Coexisitence of Magnetism and Superconductivity in Iron Pnictides Probed by Muon Spin Rotation
• Angle-resolved photoemission spectroscopy study on iron-based superconductors
• Fermi surface of Ba{1-x}KxFe2As2 as probed by angle-resolved photoemission
• Cooperative effects of Coulomb and electron-phonon interactions in the two-dimensional 16-band d-p model for iron-based superconductors
• Nodes vs. minima in the energy gap of iron-pnictides from field-induced anisotropy
• Electronic band structure of optimal superconductors: from cuprates to ferropnictides and back again
• Nematicity from mixed S_{+-} + d_{x^2-y^2} states in iron-based superconductors
• Unusual disorder effects in superconducting LaFeAs_(1-d)O_0.9F_0.1 as revealed by NMR spectroscopy
• Superconductivity and Dirac Fermions in 112-phase Pnictides
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Determination of Superconducting Gap of SmFeAsFxO1-x Superconductors by Andreev Reflection Spectroscopy
• Decoupled Pairing Amplitude and Electronic Coherence in Iron-Based Superconductors
• Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor
• Thermal Hall Conductivity as a Probe of Gap Structure in Multi-band Superconductors: The Case of $\mathrm{B}{\mathrm{a}}_{1-\mathrm{x}}{\mathrm{K}}_{\mathrm{x}}\mathrm{F}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$
• Superconductivity induced by doping Ru in SrFe2-xRuxAs2
• Unconventional multiband superconductivity with nodes in single-crystalline SrFe2(As_0.65P_0.35)2 as seen via 31P-NMR and specific heat
• Spin-Density-Wave Gap with Dirac Nodes and Two-Magnon Raman Scattering in BaFe2As2
• Simultaneous optimization of spin fluctuations and superconductivity under pressure in an iron-based superconductor
• Experimental evidence for the importance of Hund's exchange interaction for the incoherence of the charge carriers in iron-based superconductors
• Optical investigations of the chemical pressurized EuFe2(As1-xPx)2: an s-wave superconductor with strong interband interaction
• First-principles investigation of effect of pressure on BaFe${}_2$As${}_2$
• Thermal conductivity of overdoped BaFe${}_{1.73}$Co${}_{0.27}$As${}_2$ single crystal: Evidence for nodeless multiple superconducting gaps and interband interactions
• Microstructure and superconductivity of Ir-doped BaFe2As2 superconductor
• Muon-spin rotation measurements of the magnetic penetration depth in the Fe-based superconductor Ba_(1-x)Rb_(x)Fe2As2
• Zn-impurity effect and interplay of $s_{\pm }$- and $s_{++}$-pairings in Fe-based superconductors
• Emergent vortex Majorana zero mode in iron-based superconductors
• Penetration depth, lower critical fields, and quasiparticle conductivity in Fe-arsenide superconductors
• Multigap superconductivity in RbCa2Fe4As4F2 investigated using muSR measurements
• On the Structure of Superconducting Order Parameter in High-Temperature Fe-Based Superconductors
• GPU-based acceleration of free energy calculations in solid state physics
• Spin resonance peak in Fe-based superconductors with unequal gaps
• Theory of vortex structure in Josephson junctions with multiple tunneling channels: Vortex enlargement as a probe of $\pm s$-wave superconductivity
• Doping evolution of the superconducting gap structure in the underdoped iron arsenide Ba1-xKxFe2As2 revealed by thermal conductivity
• Pairing Symmetries of a Hole-Doped Extended Two-Orbital Model for the Pnictides
• Inelastic Neutron Scattering Studies of the Spin and Lattice Dynamics in Iron Arsenide Compounds
• In-gap bound states and tunneling conductance of multiband superconductors through a normal/superconductor/superconductor junction
• Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials
• Isotope effect and the role of phonon in the Fe-based superconductors
• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• Probing the Ground State Properties of Iron-based Superconducting Pnictides and Related Systems by Muon-Spin Spectroscopy
• The Critical Magnetic Field of Anisotropic Two-Band Magnetic Superconductors
• Evidence for line nodes in the energy gap of the overdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ from low-temperature specific heat measurements
• Disorder effects in multiorbital $s_{\pm }$-wave superconductors: Implications for Zn-doped BaFe${}_2$As${}_2$ compounds
• Evidence for a full energy gap for nickel-pnictide LaNiAsO_{1-x}F_x superconductors by ^{75}As nuclear quadrupole resonance
• Josephson currents in point contacts between dirty two-band superconductors
• Superconductivity and normal state properties of single-crystalline Tl0.47Rb0.34Fe1.63Se2 as seen via 77Se and 87Rb NMR
• Theory of tunnelling into a multi-band superconductor: decoherence and interference
• Magnetic and superconducting properties on S-type single-crystal CeCu${}_2$Si${}_2$ probed by ${}^{63}$Cu nuclear magnetic resonance and nuclear quadrupole resonance
• Microwave conductivity in the ferropnictides with specific application to Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$
• Doping-Dependent and Orbital-Dependent Band Renormalization in Ba(Fe_1-xCo_x)_2As_2 Superconductors
• Normal State Spin Dynamics of Five-band Model for Iron-pnictides
• Coherence lengths for superconductivity in the two-orbital negative-U Hubbard model
• Inter-layer Superconducting Pairing Induced c-axis Nodal Lines in Iron-based Superconductors
• Iron-based superconductors: tales from the nuclei
• Quasi-Two-Dimensional Fermi Surfaces and Coherent Interlayer Transport in KFe${}_2$As${}_2$
• Coherence Effect of Sign-Reversing s(+-)-wave Cooper Pair State in Heavily Overdoped LaFeAsO-based Superconductor: 75As-Nuclear Quadrupole Resonance
• Progress in nonmagnetic impurity doping studies on Fe-based superconductors
• Intergrain Josephson Currents in Multigap Superconductors: Microscopic Origin of Low Intergrain Critical Current and Its Recovery Potential in Iron-Pnictide Materials
• Optical study of Dirac fermions and related phonon anomalies in antiferromagnetic compound CaFeAsF
• Model for the inverse isotope effect of FeAs-based superconductors in the $\pi$-phase-shifted pairing state
• Phase solitons in a weakly coupled three-component superconductor
• Spin dynamics in electron-doped pnictide superconductors
• Linkage between scattering rates and superconductivity in doped ferropnictides
• Consistent picture for the electronic structure around a vortex core in iron-based superconductors
• Short-time dynamics in $s+is$-wave superconductor with incipient bands
• Spin resonance in AFe2Se2 with s-wave pairing symmetry
• Neutron Spin Resonance in the Heavily Hole-doped KFe${}_2$As${}_2$ Superconductor
• Ground state pairing correlations in the $S_4$ symmetric microscopic model for iron-based superconductors
• Electronic structures of doped BaFe${}_2$As${}_2$ materials: virtual crystal approximation versus super-cell approach
• Vortex as a probe - suggested measurement of the order parameter structure in iron-based superconductors
• Observation of non-Fermi liquid behavior in hole-doped LiFe${}_{1-x}$V${}_x$As
• Fully gapped superconductivity in SrNi${}_2$P${}_2$
• Pressure dependence of coherence-incoherence crossover behavior in KFe2As2 observed by resistivity and 75As-NMR/NQR
• Andreev bound states in iron pnictide superconductors
• Domain Walls in Normal and Superconducting States of Iron Pnictides
• Electron-boson spectral density function of correlated multiband systems obtained from optical data: Ba0.6K0.4Fe2As2 and LiFeAs
• Raman Evidence for Superconducting Gap and Spin-Phonon Coupling in Superconductor Ca(Fe0.95Co0.05)2As2
• Skyrmionic chains and lattices in $s+id$ superconductors
• Determination of the pairing state in iron-based superconductors through neutron scattering
• Localization and Orbital Selectivity in Iron-Based Superconductors with Cu Substitution
• Probing the pairing symmetry in the over-doped Fe-based superconductor Ba_0.35Rb_0.65Fe_2As_2 as a function of hydrostatic pressure
• TAO pairing: a fully gapped pairing scenario for the Iron-Based Superconductors
• Ginzburg-Landau theory of dirty two band $s_{\pm }$ superconductors
• Pressure-induced superconductivity in EuFe2As2 without a quantum critical point: magnetotransport and upper critical field measurements under high pressure
• Disentangling superconducting and magnetic orders in NaFe_1-xNi_xAs using muon spin rotation
• Vortex lattice structure in BaFe2(As0.67P0.33)2 by the small-angle neutron scattering technique
• Optical properties of the iron-chalcogenide superconductor FeTe0.55Se0.45
• Pairing Symmetry in Iron-Pnictide Superconductor KFe${}_2$As${}_2$
• Conventional Superconductivity in Fe-Based Pnictides: the Relevance of Intra-Band Electron-Boson Scattering
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Brief review on iron-based superconductors: are there clues for unconventional superconductivity?
• Coexistence of Clean- and Dirty-limit Superconductivity in LiFeAs
• High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study
• Constrain on possible pairing symmetry in a two-orbital model of FeAs-based superconductors
• Electromagnetic Proximity Effect: Superconducting Magnonics and Beyond
• Superconducting properties of (Ba-K)Fe2As2 single crystals disordered with fast neutron irradiation
• Physics picture from neutron scattering study on Fe-based superconductors
• Doping evolution of the superconducting gap structure in heavily hole-doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$: heat transport study
• Low-temperature thermal conductivity of BaFe2As2: Parent compound of iron-arsenide superconductors
• Exploration of iron-chalcogenide superconductors
• Evolution of the Fermi surface topology in doped 122 iron pnictides
• NMR investigation of vortex dynamics in Ba(Fe0.93Rh0.07)2As2 superconductor
• Interorbital pair scattering in clean and impure superconductors
• Impact of disorder on the superconducting transition temperature near a Lifshitz transition
• Superconductivity in SmFe1-xMxAsO (M = Co, Rh, Ir)
• NMR evidence for an intimate relationship between antiferromagnetic spin fluctuations and extended s-wave superconductivity in mono-crystalline SrFe2(As_{1-x}P_{x})2
• Critical properties of superconducting Ba1-xKxFe2As2
• Electronic dispersion anomalies in the iron pnictide superconductor Ba_{1-x}K_xFe_2As_2
• Magnetic torque study of the temperature dependent anisotropy parameter in overdoped superconducting single-crystal YBa_2Cu_3O_7
• Low-Energy Quasiparticles Probed by Heat Transport in the Iron Based Superconductor LaFePO
• ARPES observation of isotropic superconducting gaps in isovalent Ru-substituted Ba(Fe${}_{0.75}$Ru${}_{0.25}$)${}_2$As${}_2$
• Observation of Multiple Superconducting Gaps in the Infrared Reflectivity Spectra of Ba(Fe0.9Co0.1)2As2
• Simple Real-Space Picture of Nodeless and Nodal s-wave Gap Functions in Iron Pnictide Superconductors
• Screening of the Raman response in multiband superconductors -- application to iron-pnictides
• Novel magnetic stoichiometric superconductor EuRbFe4As4
• A Unified Description of Cuprate and Iron Arsenide Superconductors
• A Finite-temperature First-principles Approach to Spin Fluctuation in BaFe_2As_2
• Pressure effects on strained FeSe0.5Te0.5 thin films
• Infrared probe of the gap evolution across the phase diagram of Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Details of the disorder-induced transition between $s_{\pm }$ and $s_{++}$ states in two-band model for Fe-based superconductors
• Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing
• Evidence for nodeless superconducting gap in NaFe${}_{1-x}$Co${}_x$As from low-temperature thermal conductivity measurements
• Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
• Multiple Bands - A Key to High - Temperature Superconductivity in Iron Arsenides?
• Single crystal growth and physical properties of SrFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• High-Energy Damping by Particle-Hole Excitations in the Spin-Wave Spectrum of Iron-Based Superconductors
• Vortex dynamics as a function of field orientation in BaFe1.9Ni0.1As2
• Pseudogap and Strong Pairing Induced by Incipient and Shallow Bands in the Quasi-Two-Dimensional KCa${}_2$Fe${}_4$As${}_4$F${}_2$
• Band filling effects on coherence lengths and penetration depth in the two-orbital negative-U Hubbard model of superconductivity
• Pressure effects on the electronic properties of the undoped superconductor ThFeAsN
• Competitions of magnetism and superconductivity in FeAs-based materials
• Opening of the superconducting gap in the hole pockets of Ba(Fe(1-x)Co(x))2As2 as seen via Angle-Resolved PhotoElectron Spectroscopy
• Isostructural spin-density-wave and superconducting gap anisotropies in iron-arsenide superconductors
• Effect of electron correlations on spin excitation bandwidth in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$ as seen via time-of-flight inelastic neutron scattering
• Upper critical field of the 122-type iron pnictide superconductors
• Orbitally resolved lifetimes in Ba(Fe0.92Co0.08)2As2 measured by ARPES
• Genuine Electronic Structure and Superconducting Gap Structure in (Ba${}_{0.6}$K${}_{0.4}$)Fe${}_2$As${}_2$ Superconductor
• Supercurrent Diode Effect in Josephson Interferometers with Multiband Superconductors
• Constraints Imposed by Symmetry on Pairing Operators for the Pnictides
• The effect of disorder on electronic Raman scattering in the superconducting state of iron pnictides
• Two-Gap Superconductivity in CaFe_{0.88}Co_{0.12}AsF Revealed by Temperature Dependence of the Lower Critical Field H_{c1}^c(T)
• Theory of Mixed-State Effect on Quasiparticle Interference in Iron-based Superconductors
• Emergence of Superconductivity from Fully Incoherent Normal State in an Iron-Based Superconductor (Ba${}_{0.6}$K${}_{0.4}$)Fe${}_2$As${}_2$
• Impurity Scattering Rate and Coherence factor in Vortex Core of Sign-reversing s-wave Superconductors
• The effect of spin fluctuations on the electronic structure in iron based superconductors
• Multi-band superconductivity in LaFeAsO_{0.9}F_{0.1} single crystals probed by high-field vortex torque magnetometry
• Multiple Superconducting Gaps, Anisotropic Spin Fluctuations and Spin-Orbit Coupling in Iron-Pnictides
• In-gap Bound States Induced by Interstitial Fe Impurities in Iron-based Superconductors
• Sheet Dependence on Superconducting Gap in Oxygen-Deficient Iron-based Oxypnictide Superconductors NdFeAs0.85
• Evolution of quasiparticle states with and without a Zn-impurity in doped 122 iron pnictides
• The effects of Coulomb interactions on the superconducting gaps in iron-based superconductors
• Effect of Fermi Surface Topology on Inter-Layer Magnetoresistance in Layered Multiband Systems: Application to LaFeAsO1-xFx
• Vortex lattice and vortex bound states in CsFe${}_2$As${}_2$ investigated by scanning tunneling microscopy/spectroscopy
• Q-scan-analysis of the neutron scattering in iron-based superconductors
• Evidence the ferromagnetic order on CoSb layer of LaCoSb${}_2$
• Neutron Spin Resonance Near a Lifshitz Transition in Overdoped Ba${}_{0.4}$K${}_{0.6}$Fe${}_2$As${}_2$
• Unconventional Multi-gap Superconductivity and Antiferromagnetic Spin Fluctuations in New Iron-arsenide LaFe2As2 in Heavily Electron-doped Regime
• Anomalous sharp peak in the London penetration depth induced by the nodeless-to-nodal superconducting transition in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Multiband superconductivity in $\mathrm{Bi}{\mathrm{S}}_2$-based layered compounds
• Coexistence of Bloch electrons and glassy electrons in Ca10(Ir4As8)(Fe2_xIrxAs2)5 revealed by angle-resolved photoemission spectroscopy
• Majorana Zero Modes in Semiconductor Nanowires in Contact with Higher-$T_c$ Superconductors
• Suppression of $T_c$ by Zn impurity in the electron-type LaFe${}_{0.925-y}$Co${}_{0.075}$Zn${}_y$AsO system
• Unconventional superconductivity originating from disconnected Fermi surfaces in the iron-based compound
• Slope of the upper critical field at $T_c$ in two-band superconductors with non-magnetic disorder: $s_{++}$ superconductivity in ${\text{Ba}}_{1-x}{\text{K}}_x{\text{Fe}}_2{\text{As}}_2$
• Hyperbolic fringe signal for twin impurity quasiparticle interference
• Observation of strong-coupling pairing with weakened Fermi-surface nesting at optimal hole doping in Ca${}_{0.33}$Na${}_{0.67}$Fe${}_2$As${}_2$
• Effective three-band structure in Fe-based superconductors
• Unconventional superconductivity in iron-base superconductors in a three-band model
• Angle-resolved photoemission studies of the superconducting gap symmetry in Fe-based superconductors
• Roles of anisotropic and unequal gaps in the quasiparticle interference of superconducting iron pnictides
• Growth of (NaxKy)FezSe2 crystals by chlorides flux at low temperatures
• Revealing the intrinsic superconducting gap anisotropy in surface-neutralized BaFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• Orbital and Pauli limiting effects in heavily doped Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Specifics of impurity effects in ferropnictide superconductors
• Impurity states in antiferromagnetic Iron Arsenides
• Collective Mode at Lifshitz Transition in Iron-Pnictide Superconductors
• Deviating band symmetries and many-body interactions in a model hole doped iron pnictide superconductor
• Isotropic multi-gap superconductivity in BaFe1.9Pt0.1As2 from thermal transport and spectroscopic measurements
• Effect of inelastic scattering on the nuclear magnetic relaxation rate 1/T1T in iron-based superconductors
• Superconducting Gaps via Raman Scattering in Iron Superconductors
• Effect of transition-metal substitution in iron-based superconductors
• Superconducting gap and pseudogap in the surface states of the iron-based superconductor PrFeAsO${}_{1-y}$ studied by angle-resolved photoemission spectroscopy
• Upper critical fields in high-$T_{\mathrm{c}}$ superconductors
• Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Orbital-dependent modulation of the superconducting gap in uniaxially strained Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$
• Quantum dynamics of hydrogen in iron-based superconductor LaFeAsO0.9D0.1 measured with inelastic neutron spectroscopy
• Magnetic disorder and gap symmetry in optimally electron doped Sr(Fe, Co)${}_2$As${}_2$ superconductor
• Investigation of magnetic phases in parent compounds of Iron-chalcogenides via quasiparticle scattering interference
• Orbital-transverse density-wave instabilities in iron-based superconductors
• Superconductivity In K- And Na- Doped Bafe2as2: What Can We Learn From Heat Capacity And Pressure Dependence of Tc
• Superconducting Gap and Symmetry in FeSe_1-x_Te_x_ Studied by Specific Heat in Magnetic Fields
• Suppression of the antiferromagnetic order when approaching the superconducting state in a phase-separated crystal of K${}_x$Fe${}_{2-y}$Se${}_2$
• Electronic structure and possible pseudogap behavior in iron based superconductors
• Flat band effects on the ground-state BCS-BEC crossover in atomic Fermi gases in a quasi-two-dimensional Lieb lattice
• The Hund's Superconductor Li(Fe,Co)As
• Influence of multiorbitals and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors
• Effects of single- and multi-substituted Zn ions in doped-122 type iron-based superconductors
• Hybrid Crystals of Cuprates and Iron-Based Superconductors
• Fermi Surface of KFe${}_2$As${}_2$ from Quantum Oscillations in Magnetostriction
• Specific heat of Ba${}_{0.59}$K${}_{0.41}$Fe${}_2$As${}_2$, and a new method for identifying the electron contribution: two electron bands with different energy gaps in the superconducting state
• Observation of a van Hove singularity and implication for strong coupling induced Cooper pairing in KFe2As2
• Scanning Tunneling Spectroscopy on SrFe${}_2$(As${}_{1-\mathrm{x}}$P${}_{\mathrm{x}}$)${}_2$
• No anomalous spin fluctuation in optimally doped and overdoped iron-based oxypnictide superconductors LaFeAsO${}_{1-x}$F${}_x$ probed by muon spin relaxation
• A Field-directional Specific Heat Study on the Gap Structure of Overdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• High resolution Compton scattering as a Probe of the Fermi surface in the Iron-based superconductor $La{O}_{1-x}{F}_{x}FeAs$
• Superconducting states of a J1-J2-K model for iron pnictides
• Coherence effect in a two-band superconductor: Application to iron pnictides
• A Unified Theory for the Cuprates, Iron-Based and Similar Superconducting Systems: Application for Spin and Charge Excitations in the Hole-Doped Cuprates
• Superconducting Mechanism through direct and redox layer doping in Pnictides
• A Short Review of the $S_4$ Symmetric Microscopic Model for Iron-Based High Temperature Superconductors
• Robust $s_{\pm }$-wave superconductivity against multi-impurity in iron-based superconductors
• The Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ superconducting four-gap temperature evolution: a multi-band Chebyshev-BdG approach
• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides
• Nodal superconducting gap in LiFeP revealed by NMR: contrast with LiFeAs
• Lattice Disorder Effect on Magnetic Ordering of Iron Arsenides
• Band structure and Fermi surfaces of the reentrant ferromagnetic superconductor Eu(Fe0.86Ir0.14)2As2
• Optical and transport properties of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ films
• Properties and challenges of hot-phonon physics in metals: MgB${}_2$ and other compounds
• Hund's coupling assisted orbital-selective superconductivity in Ba1-xKxFe2As2
• Tuning Superconductivity by Isovalent Antimony Substitution in PrFeAs(O,F)
• Gap Structure of the Overdoped Iron-Pnictide Superconductor Ba(Fe${}_{0.942}$Ni${}_{0.058}$)${}_2$As${}_2$: A Low-Temperature Specific-Heat Study
• Nesting-induced Local Electronic Patterns around a Single As (Te, Se) Vacancy in Iron-based Superconductors
• Iron-Based Superconductors as Parity Odd Superconductors
• Observation of a ubiquitous three-dimensional superconducting gap function in optimally-doped Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$
• Zero Energy Bound States on Nano Atomic Line Defect in Iron-based High Temperature Superconductors