Magnetic field dependence of Jc for Gd-123 coated conductor on PLD-CeO2 capped IBAD-GZO substrate tapes
Abstract:We prepared GdBa2Cu3O7- (Gd-123) coated conductors by the pulsed laser deposition (PLD) method on PLD-CeO2/ion-beam assisted deposition (IBAD)-Gd2Zr2O7 (GZO)/hastelloy metal substrate tapes. The Gd-123 film showed a higher critical current density (Jc) in magnetic fields (B) and higher critical temperature (Tc) than those of YBa2Cu3O7- (Y-123) film. The Gd-123 film exhibited a high Jc value of 0.19MAcm-2 at 3T (&B\parallel c ;) in liquid nitrogen (77K), and the Tc value was 93.8K. The Jc value at 3T was twice as high as that of Y-123 film. Moreover, the angular dependence in magnetic fields of Jc for Gd-123 was also superior to that of Y-123. The reduction of Jc by the magnetic field angle for Gd-123 was less sensitive than that in Y-123. Furthermore, Gd-123 clearly exhibited a peak at 0° (&B\parallel c ;) as well as at 90° (&B \perp c ;) in the relationship of Jc on the magnetic field angle curve (Jc–), while Y-123 had no peak at 0°. These superior characteristics are considered to be due to the existing defects, such as stacking faults, as observed by transmission electron microscopy. PLD-Gd-123 coated conductors, with pinning-effective defects, high Jc and low anisotropy in Jc–, show promise for future applications.
Document Type: Research Article
Publication date: August 1, 2005