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

概要

論文の詳細を見る
The transport properties, upper critical fields, superconducting anisotropy, andcritical current density of an iso-valent phosphorus-doped BaFe2As2 single crystal close tooptimum doping are investigated in this report. Temperature dependent resistivity andsusceptibility show a superconducting transition temperature, Tc, just below 31 K both withsharp transitions. The upper critical field parallel to the ab-plane, Hc2ab, is above 77 Teslawhile that along the c-axis direction, Hc2c, is just above 36 Tesla, yielding a lowsuperconducting anisotropy ratio ~ 2. The estimated inter-plane coherence length based on theGinzburg-Landau (G-L) theory indicates BaFe2(As0.68P0.32)2 is still above the point for adimensional crossover inferring the superconducting layers are not weakly-coupled in thissystem. The critical current density at 5 K obtained from magnetization loops measurementshow a modest Jc as high as 105 A/cm2.