Impurity Scattering Effect on Superconductivity and the Violation of Anderson Theorem in Ba(Fe1-xCox)2As2 Single Crystals
Abstract
Low-temperature specific heat (SH) and resistivity were measured on Ba(Fe1-xCox)2As2 single crystals in wide doping region. A sizeable residual specific heat coefficient γ0 was observed in the low temperature limit of all samples. The specific heat jump near Tc, i.e. C/T|Tc and the upper critical field Hc2c (H||c) were also determined. It is found that -γ0, C/T|Tc, Hc2c and Tc all shared a similar evolution with doping. All these can be well understood within the model of S pairing symmetry when accounting the Co-dopants as unitary scattering centers in the FeAs planes. Our results give a direct evidence for the violation of the Anderson theorem in FeAs-based superconductors.
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