gamma-ray irradiation effects of Au/PbTiO3/YBa2Cu3O7-delta capacitors under different bias voltage

Total dose radiation effects on Au/PbTiO3/YBa2Cu3O7-delta (YBCO) capacitors fabricated by pulsed excimer laser deposition (PLD) on SrTiO3 substrates h ave been investigated. Capacitance-voltage characteristics and the retained polarization property of the capacitors have been measured before and afte r gamma-ray irradiation. The +4 and 0 V bias was applied across the capacit ors during the irradiation. The results showed that with the increment of t he total dose, the retained polarization, dielectric constant and the coerc ive field decreased. The results have been interpreted by radiation-induced positive charges and a defect trap model. (C) 2000 Elsevier Science B.V. A ll rights reserved.