High Critical Current Density of c-Axis-Oriented MgB2 Thin Films

Abstract

From the magnetic hysteresis loops (M-H) and the current-voltage (I-V) relations, we obtained the critical current density (Jc) for c-axis-oriented MgB2 thin films with a transition temperature of 39 K. The temperature dependence of Jc obtained from the M-H and the I-V curves coincide, which indicates the strongly linked nature of the intergrains in these thin films. And, the high value of Jc was estimated to be ∼4×107 A/cm2 at 5 K and ∼1×105 A/cm2 at 37 K under a self field, indicating a promising candidate for technological applications.