Institute of Physics Conference Series issue:158 pages:985-988
Pulsed Field Magnetisation Measurements (PFMM) in a field range up to 50 Tesla are compared with SQUID and VSM magnetisation measurements in lower fields. Experiments on fast melt processed YBa2Cu3O7 with Y2BaCuO5 inclusions show high values of the "magnetic" critical current (j(c) > 10(9) A/m(2) at T=20 K and mu(0)H similar to 4 T). The j(c) values are quite different for the pulsed field, the SQUID and VSM magnetisation measurements since the voltage criterion associated with these different magnetisation measurement techniques extends over a 12 decade window, thus allowing us to construct the E-j characteristic. The PFMM seem to be most suitable to determine the "real" critical current which is defined as the current density j inside the sample reaching its limiting value j(c).