The electric transport properties of a GdBa2Cu3O7-δ thin film containing 12 mol% nano-sized BaHfO3 (BHO) particles grown by chemical solution deposition were investigated in a wide range of temperatures (4.2 ≤T ≤ 77 K) and magnetic fields up to μ0H = 19 T. The exponent n of the electric field-current density characteristics (E ∞Jn) depends on critical current density Jc as (n-1)∞Jαc (α∼0.45) irrespective of measurement temperature for H ≈ c. On the other hand, this relation does not hold for H ≈ ab. The angular dependence of Jc is almost similar to that of n except for the angle close to the ab-plane. A dip of n around this angle regime was observed below 77 K, whereas Jc exhibited a maximum. At T ≤50 K a tiny peak in the dip was observed that increases with decreasing temperatures. These results suggest that the pinning mechanism changes with temperature for H ≈ ab.
- BHO nano-particles
- GdBCO thin film
- chemical solution deposition
- electrical transport properties