Vortex pinning/dynamics in YBCO films with J{sub c} (77 K) {gt} 3{center{underscore}dot}10{sup 6} A/cm{sup 2} studied by direct transport measurements

Critical current density, J{sub c}, is studied for highly biaxially-oriented YBCO thin films with J{sub c}(77 K) > 3 MA/cm{sup 2} in a range of magnetic fields, temperatures, angles between magnetic field vector and film c-axis. J{sub c}(H,{theta}) is shown to be dominated by vortex interaction with high density (>10{sup 11} lines/cm{sup 2}) of linear pins--edge dislocations. A model is developed to describe different vortex arrays behavior in the presence of two-dimensional square network of linear pins.