Atomic origin of the coexistence of high critical current density and high Tc in CuBa2Ca3Cu4O10+? superconductors

Abstract For cuprate superconductors, a high critical transition temperature ( T c ) can be realized in compounds containing multiple CuO 2 layers the unit cell, while current density J is rarely sustained above liquid nitrogen temperature. The CuBa Ca 3 Cu 4 O 10+? (Cu-1234) superconductors synthesized under oxygen pressure incredibly exhibit (~117 K) and (>10 A/cm , 100 values. Here, “double high” traits of Cu-1234 were investigated with advanced scanning transmission electron microscopy. It was revealed that ordering vacancies plate-like 90° microdomains induced efficient microstructure pinning centers suppressed vortex flux flow enhanced . Furthermore, metallic charge-reservoir blocks [Ba 3+? ] composed unique compressed [CuO 6 octahedra, which many holes p z symmetry significantly decreased superconducting anisotropy dramatically interlayer coupling guaranteed On other hand, optimally doped planes inside thick [Ca 8 maintained Our results are applicable to design synthesis new traits.