Frequency, amplitude of magnetic field and temperature characterization of YBCO using higher harmonics ac susceptibility measurements near Tc

Abstract Analysis on the higher harmonic ac susceptibility of the YBCO samples at fixed temperature near T c versus frequency (107–1200 Hz) and magnitude (2–8 G) of the applied magnetic field have been done. The pinning potential U p and critical current density J c have been achieved by comparison of experimental measurement with the numerical analysis of the non-linear magnetic diffusion equation inside the samples.