Critical Current Density Enhancement around a Matching Field in ErBa₂Cu₃O_7-δ Films with BaZrO₃ Nano-Rods

Abstract

Field angular dependences of critical current density are measured for as-grown high crystalline quality ErBa 2 Cu 3 O 7-δ films with BaZrO 3 nano-rods. Large critical current density enhancement is observed. The magnetic field where the enhancement is observed coincides with the matching field calculated from the density of BaZrO 3 nano-rods. The largest enhancement is observed in B ∥ c -axis of ErBa 2 Cu 3 O 7-δ films. This anisotropic critical current density enhancement is thought to be caused by the direction of BaZrO 3 nano-rods which grow along the c -axis of the films. BaZrO 3 nano-rods in the films will promise the application of coated conductors in a magnetic field.