Thick YBa2Cu3O7-x BaSnO3 Films with Enhanced Critical Current Density at High Magnetic Fields

摘要

The thickness dependence was studied for the critical current density (Jc) of YBa2Cu3O7-x (YBCO) + BaSnO3 (BSO) nanocomposite films. These films showed a significantly reduced decline of the Jc with thickness, especially at high magnetic fields. For example, a 2-micron-thick YBCO+BSO film had a Jc approx. 3x105 A/cm2 at 5 T as compared to a typical Jc of 2.4x103 A/cm2 at 5 T for a 300-nm-thick YBCO film. The thick YBCO+BSO films maintained high Tc (>88 K) and had a high density of continuous BSO nanocolumns that likely contributed for the observed Jc enhancements.