Frequency dependence of the intergranular magnetic flux penetration in ceramic $YB{a}_{2}C{u}_3{O}_x$ uperconductor

A. A. Sahakyan, S. K. Nikoghosyan, G. N. Yeritsyan

By means of small magnetic field ac susceptibility measurement at 10 kHz we found that the real and imaginary parts of ceramic $YB{a}_{2}C{u}_3{O}_x$ susceptibility in presence of the ext…