Dynamical scaling analysis of susceptibility in ceramic YBCO superconductors

Abstract Dynamical properties of the ceramic YBa 2 Cu 3 O 7− δ have been investigated by magnetic measurements. We measured ac-susceptibilities at various frequency under zero external field and carried out dynamic scaling analysis near inter-grain transition temperature. The results exhibit scaling behavior for the critical exponents zν =8 and β =0.5. These values are fairly close to the ones for the chiral-glass estimated by Monte Carlo simulations.