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We report the influence of crystalline defects introduced by 6 MeV$^{16}$O$^{3+}$ irradiation on the critical current densities J$_c$ and fluxcreep rates in 1.3 $\mu$m thick GdBa$_2$Cu$_3$O$_{7-d}$ coated conductorproduced by co-evaporation. Pristine films with pinning produced mainly byrandom nanoparticles with diameter close to 50 nm were irradiated with dosesbetween 2x10$^{13}$ cm$^{-2}$ and 4x10$^{14}$ cm$^{-2}$. At temperatures below40 K with the magnetic field applied parallel (H//c) and at 45{\deg}(H//45{\deg}) to the c-axis, the in-field J$_c$ dependences can besignificantly improved by irradiation. For doses of 1x10$^{14}$ cm$^{-2}$ theJ$_c$ values at $\mu$$_0$H = 5 T are doubled without affecting significantlythe J$_c$ at small fields. Analyzing the flux creep rates as function of thetemperature in both magnetic field configurations, it can be observed that theirradiation suppresses the peak associated with double-kink relaxation andincreases the flux creep rates at intermediate and high temperatures. Under 0.5T, the flux relaxation for H//c and H//45{\deg} in pristine films presentscharacteristic glassy exponents $\mu$ = 1.63 and $\mu$ = 1.45, respectively.For samples irradiated with 1x10$^{14}$ cm$^{-2}$, these values drop to $\mu$ =1.45 and $\mu$ =1.24, respectively.

physica c superconductivity

Effect of mixed pinning landscapes produced by 6 MeV Oxygen irradiation  on the resulting critical current densities J$_c$ in 1.3 $\mu$m thick  GdBa$_2$Cu$_3$O$_{7-d}$ coated conductors grown by co-evaporation