High, magnetic field independent critical currents in (Ba,K)Fe_(2)As_(2) crystals

摘要

Each discovery of a new high temperature superconductor drives the expectation that advanced engineering of materials defect structures will enable effective vortex pinning and high values of the electrical current density. Here, we demonstrate that single crystals of the iron-based superconductor Ba_(0.6)K_(0.4)Fe_(2)As_(2) with T_(c) velence 37.5K can accommodate an unprecedented large concentration of strong-pinning defects in the form of discontinuous nm-sized nanorods with no degradation of the superconducting transition temperature. At a temperature of 5 K, we find a critical current density of 5 MA/cm~(2) that is magnetic field independent in fields up to 7 T.