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High critical current density (Jc) and small magnetic relaxation are crucial for technological applications of high temperature superconductors. So far, improved Jc has been reported, based on the pinning of vortices via local structural inhomogeneities in superconductors, which are induced by chemical doping, irradiation, and inclusion of non-superconducting secondary phases. In cuprates and iron-based superconductors (IBSCs), the superconducting state is induced mainly through chemical doping/substitution (x) and high pressure. Chemical doping (addition of holes or electrons) can change the lattice parameters and introduce internal chemical pressure, which modulate the electronic band structure and the density of states at the Fermi level through changes to the carrier concentration. High pressure is a well-known clean and effective tuning technique to explore superconductivity. In an IBSC, the most significant effect of high pressure is directly causing a reduction in the cell volum

Y dy baFlux pinningOated conductorsCritical current densityAgnetic relaxationTwinning energy