The Longitudinal Magnetic Field Effect in Multilayered-SmBa₂Cu₃O_y Film at Wide Range Measurement Temperatures

Abstract

 We report the longitudinal magnetic field effect on BaHfO₃ (BHO)-doped-multilayered SmBa₂Cu₃O_y (SmBCO) films fabricated on single-crystalline substrates by pulsed laser deposition method. This longitudinal magnetic field effect was observed under the force-free state and this peculiar state caused the gain of the critical current density (J_c) with a peak against magnetic fields. We have reported that the J_c peak appears on multilayered SmBCO films with short BHO nanorods. In this study, we observed the remarkable J_c gain by up to 32% compared with the J_c in self-field. In addition, we measured the J_c-B curves at several temperatures.

Fig. 5

Schematic drawing of the pinned flux line near the film surface under the force-free state.