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Pristine and BaHfO 3  (BHO) nanocomposite GdBa 2 Cu 3 O 7  (GdBCO) superconducting thin films were deposited at 800 °C, 0.4 mbar O 2  partial pressure using a Nd:YAG laser (λ=355 nm) with 10 Hz frequency on MgO substrate. The influence of the oxygenation process on flux pinning and electrical transport properties was investigated by changing the annealing temperature ( T ann ) between 450 °C and 780 °C and the holding time ( t hold ) between 10 and 30 min. The irreversibility field shows the largest shift toward higher fields for  T ann  = 450 °C and thus the largest in-field  J c . Angular dependence of  J c  for most of the pristine GdBCO films exhibits a large peak for  B ‖ c , however the sample with  T ann  = 550 °C has a large peak in the 90°-120° region, i.e. near  B  ‖  ab . For BHO nanocomposites, a decrease in  T ann  increases in-field  J c  by a factor of 2.

Effect of oxygenation process on flux pinning in pristine and BaHfO3 nanocomposite GdBa2Cu3O7 superconducting thin films