The effect of temperature on Jc and n-value of Bi(2 2 2 3) tapes Original Research Article

The critical current density and n-values on four types of Bi2Sr2Ca2CuOx tapes have been studied from 40 K to the critical temperature. The results showed that the critical current density appears in three periods with decreasing temperature. Compared to Ag alloy-sheathed tapes, the critical current density of Ag-sheathed tape is more affected by temperature. It also appeared that n-values have a maximized value near the temperature of liquid nitrogen. When the temperature is lower than 60 K, although the critical current density still shows apparent improvement, n-values are very low.