Thermodynamic approach for enhancing superconducting critical current performance

Abstract The addition of artificial pinning centers has led to an impressive increase in the critical current density ( J c ) superconductors, enabling record-breaking all-superconducting magnets and other applications. superconductors reached ~0.2–0.3 d , where is depairing density, numerical factor depends on optimization. By modifying λ and/or ξ, penetration depth coherence length, respectively, we can . For (Y 0.77 Gd 0.23 )Ba 2 Cu 3 O y ((Y,Gd)123), achieve this by controlling carrier which related ξ. We also tune ξ chemical pressure Fe-based i.e., BaFe (As 1− x P films. variation leads intrinsic improvement via allowing extremely high values 130 MA/cm 8.0 at 4.2 K, consistent with enhancement a for both incoherent nanoparticle-doped (Y,Gd)123 coated conductors (CCs) films, showing that new material design useful achieving densities wide array superconductors. remarkably vortex-pinning force combination thermodynamic optimization route CCs ~3.17 TN/m K 18 T H || ), highest ever reported any superconductor.