Speaker
Description
Driven by their exceptional superconducting performance at high fields, iron-based superconductors have been the focus of sustained efforts toward practical applications. However, challenges persist in fabricating high-performance iron-based superconducting long wires and tapes fabricated by the powder-in-tube method. Recent studies have identified key factors limiting the current-carrying capacity: poor grain connectivity and lack of strong pinning centers. Through innovative grain boundary engineering and stress-driven dislocation pinning, a new record high critical current density of Jc=4.5×105 A/cm² has been achieved at 4.2 K and 10 T. In addition, benefiting from the well-established mass production of high-quality precursors, the 100-meter-long tapes have demonstrated homogeneous Jc values exceeding the practical application threshold (105 A/cm²) at 4.2 K and 10 T. Building on these high-performance long tapes, an iron-based superconducting insert pancake coil successfully generated a one-tesla magnetic field at a background field of 20 T. Collectively, these advancements strongly indicate a promising future for the application of iron-based superconductors at high magnetic fields.
