Anomalous Superconducting-Gap Structure of Slightly Overdoped Ba(FeCo)As
arXiv:1408.4260 · doi:10.7566/JPSJ.83.093703
Abstract
We observed the anisotropic superconducting-gap (SC-gap) structure of a slightly overdoped superconductor, Ba(FeCo)As (), using three-dimensional (3D) angle-resolved photoemission spectroscopy. Two hole Fermi surfaces (FSs) observed at the Brillouin zone center and an inner electron FS at the zone corner showed a nearly isotropic SC gap in 3D momentum space. However, the outer electron FS showed an anisotropic SC gap with nodes or gap minima around the M and A points. The different anisotropies obtained the SC gap between the outer and inner electron FSs cannot be expected from all theoretical predictions with spin fluctuation, orbital fluctuation, and both competition. Our results provide a new insight into the SC mechanisms of iron pnictide superconductors.
arXiv comment11 pages, 4 figures
References in corpus (25)
- Unconventional sign-reversing superconductivity in LaFeAsO_(1-x)F_x
- Unconventional pairing originating from disconnected Fermi surfaces in superconducting LaFeAsOF}
- Observation of Fermi-surface-dependent nodeless superconducting gaps in Ba0.6K0.4Fe2As2
- Pnictogen height as a possible switch between high-T_c nodeless and low-T_c nodal pairings in the iron based superconductors
- Orbital Fluctuation Mediated Superconductivity in Iron Pnictides: Analysis of Five Orbital Hubbard-Holstein Model
- Symmetry breaking orbital anisotropy on detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
- Fermi surface nesting induced strong pairing in iron-based superconductors
- Scanning Tunneling Spectroscopy and Vortex Imaging in the Iron-Pnictide Superconductor BaFeCoAs
- Contrasting Spin Dynamics Between Underdoped and Overdoped Ba(Fe[1-x]Co[x])2As2
- Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
- Quantum criticality and nodal superconductivity in the FeAs-based superconductor KFe2As2
- Line nodes in the energy gap of high-temperature superconducting BaFe_2(As_{1-x}P_x)_2 from penetration depth and thermal conductivity measurements
- Structural quantum criticality and superconductivity in iron-based superconductor Ba(Fe1-xCox)2As2
- Nodal superconducting gap structure in ferropnictide superconductor BaFe2(As0.7P0.3)2
- Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba1-xKxFe2As2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density
- Nodes in the gap structure of the iron-arsenide superconductor Ba(Fe_{1-x}Co_x)_2As_2 from c-axis heat transport measurements
- Doping dependence of heat transport in the iron-arsenide superconductor Ba(FeCo)As: from isotropic to strongly -dependent gap structure
- ^{31}P and ^{75}As NMR evidence for a residual density of states at zero energy in superconducting BaFe_2(As_{0.67}P_{0.33})_2
- Electronic structure of heavily electron-doped BaFeCoAs studied by angle-resolved photoemission
- Local measurement of the penetration depth in the pnictide superconductor Ba(FeCo)As
- Possible three dimensional nodes in the superconducting gap of BaFe(AsP)
- Abrupt change in the energy gap of superconducting Ba1-xKxFe2As2 single crystals with hole doping
- Nodal gap structure in Fe-based superconductors due to the competition between orbital and spin fluctuations
- Calorimetric Evidence for Nodes in the Overdoped Ba(FeCo)As
- Specific Heat To Hc2: Evidence for Nodes or Deep Minima in the Superconducting Gap of Under- and Overdoped Ba(Fe1-xCox)2As2
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