Psuedo-isotropic upper critical field in cobalt-doped SrFe2As2 epitaxial films

Abstract

The temperature and angular dependence of the upper critical field (Hc2) is reported for cobalt-doped SrFe2As2 epitaxial films between Tc and 0.5 K in pulsed magnetic fields up to 50 T. For H parallel c, Hc2 is close to a linear function of temperature, while in the perpendicular direction there is significant downward curvature that results in an Hc2 ratio (gamma = Hc2(perpendicular)/Hc2(parallel) that decreases nearly linearly with temperature, approaching gamma = 1 at low temperature with Hc2(0) = 47 T. We measure the complete upper-critical field phase diagram including angular dependence and model the data using a two band theory allowing us to determine the anisotropy of both bands, their relative diffusivities, and the relationship between BCS coupling constant matrix elements. We find an unusual relationship between the diffusivities of the two bands, with two anisotropic and opposite bands. This relationship is supported by the observation of a local maximum for Hc2(parallel) at low temperature.

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• Superconductivity in Undoped Single Crystals of BaFe2As2: Field and Current Dependence
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• Superconducting Properties and Phase Diagram of Indirectly Electron-Doped (Sr1-xLax)Fe2As2 Epitaxial Films Grown by Pulsed Laser Deposition
• Fluctuations in two-band superconductors in a strong magnetic field
• Upper critical fields and superconducting anisotropy of K0.70Fe1.55Se1.01S0.99 and K0.76Fe1.61Se0.96S1.04 single crystals
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• Nearly isotropic upper critical fields in a SrFe${}_{1.85}$Co${}_{0.15}$As${}_2$ single crystal
• Upper critical field of the 122-type iron pnictide superconductors
• Enhancement of the upper critical field in codoped iron-arsenic high-temperature superconductors
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