Upper critical fields and critical current density of BaFe2(As0.68P0.32)2 single crystal

الأصل · EN

The transport properties, upper critical fields, superconducting anisotropy, and critical current density in an iso-valent phosphorus-doped BaFe2As2 single crystal close to optimum doping are investigated in this report. Temperature dependent resistivity and susceptibility show a superconducting transition temperature, Tc, just below 31 K both with sharp transitions. The upper critical field parallel to the ab-plane, Hc2ᵃb, is above 77 Tesla while that along the c-axis direction, Hc2ᶜ, is just above 36 Tesla, yielding a low superconducting anisotropy ratio 2. The estimated inter-plane coherence length based on the Ginzburg-Landau (G-L) theory indicates BaFe2(As0.68P0.32)2 is still above the point for a dimensional crossover inferring the superconducting layers are not weakly-coupled in this system. The critical current density at 5 K obtained from magnetization loops measurement show a modest Jc as high as 10⁵ A/cm2.