Applied superconductivity 1995, vols. 1 and 2 vol:148 pages:971-974
The magnetisation M(H,T) of thin dc-sputtered Bi2Sr2Ca2Cu3O10 and Bi(2)Sr(2)CaCn(2)O(8) films has been measured in pulsed fields up to 50 T. A high critical current density (J(c) greater than or equal to 10(6)A/cm(2) at T=5K and mu(0)H=50 T) has been derived from the width of the M(H) loops. For Bi2Sr2Ca2Cu3O10 in particular, above mu(0)H=20 T, this critical current becomes weakly field dependent. Therefore, these materials are of considerable interest for high field applications at low temperatures. The nature of pinning centres responsible for this J(c)(H) behaviour is discussed.