A doping dependent specific heat study of the superconducting gap in Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$

Abstract

We report a doping, magnetic field and low-temperature dependent study of the specific heat of the iron-arsenide Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ at under (x=0.045), optimal (x=0.08) and overdoped (x=0.103 and 0.105) regimes. By subtracting the lattice specific heat the temperature and magnetic field dependence of the electronic specific heat has been studied. The temperature and field dependencies of the superconducting part of $C_p$ exhibit similar behavior for all doping concentrations. The temperature variation of the electronic specific heat as well as its field dependence cannot be described by a single isotropic s-wave gap, pointing to a complex gap structure in the system. The lack of doping dependence indicates that the gap structure does not change significantly as a function of doping. We also observe a significant residual linear term of unknown origin in the specific heat of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ which suggests that inhomogeneity may be an important factor in Co-doped BaFe${}_2$As${}_2$

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• Superfluid Density and Field-Induced Magnetism in Ba(Fe1-xCox)2As2 and Sr(Fe1-xCox)2As2 Measured with Muon Spin Relaxation
• Specific Heat Discontinuity DeltaC vs Tc in Annealed Ba(Fe1-xCox)2As2
• Strong-Coupling Superconductivity in NaFe${}_{1-x}$Co${}_x$As: the Eliashberg Theory and Beyond
• Anomalous proximity effects at the interface of s and s+- superconductors
• Calorimetric Evidence for Nodes in the Overdoped Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$
• Theoretical Investigation of Optical Conductivity in Ba [Fe(1-x)Co(x)]2 As2
• Anomalous thermodynamic power laws near topological transitions in nodal superconductors
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• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• 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
• Role of Magnetism in Superconductivity of BaFe2As2: Study of 5d Au-doped Crystals
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• Robust accidental nodes and zeroes and critical quasiparticle scaling in iron-based multiband superconductors
• Effect of annealing on the specific heat of optimally doped Ba(Fe${}_{0.92}$Co${}_{0.08}$)${}_2$As${}_2$
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• Electronic specific heat in BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors
• Specific Heat vs Field of LiFe1-xCuxAs
• The Origin of Condensation Energy Scaling of the Fe-based superconductors
• Metallicity of Ca2Cu6P5 with Single and Double Copper-Pnictide Layers
• Persistent Magnetism in Silver-doped BaFe2As2 Crystals
• Calorimetric study of the superconducting and normal state properties of Ca(Fe1-xCox)2As2
• Gap Structure of the Overdoped Iron-Pnictide Superconductor Ba(Fe${}_{0.942}$Ni${}_{0.058}$)${}_2$As${}_2$: A Low-Temperature Specific-Heat Study
• $a-b$ Plane Point Contact Spectroscopy measurements of optimally Cobalt doped Ba-122 iron-pnictide superconductors