Nonlinear ac susceptibility studies of high-$T_c$ rings: Influence of the structuring method and determination of the flux creep exponent

S. Streubel, F. Mrowka, M. Wurlitzer +2

We have studied the influence of the patterning procedure on the critical current density of high-$T_c$ YBa${}_2$Cu${}_3$O${}_{7-\delta }$ thin rings using the nonlinear ac susceptibility meth…