Dislocation Density and Critical Current Density of Sm1+xBa2-xCu3Oy Films Prepared by Various Fabrication Processes

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Dislocations are effective flux-pinning centers in REBa2Cu3Oy films at a magnetic field. To investigate the relationship between critical current density ($J_{\text{c}}$) and dislocation density, we discussed the dislocations in conventional pulsed-laser-deposition (PLD)-SmBCO films, vapor–liquid–solid (VLS)-SmBCO films, and low-temperature growth (LTG)-SmBCO films. The LTG-SmBCO and VLS-SmBCO films showed high-$J_{\text{c}}$ at low magnetic fields. From the observation of etch pits, we found that the LTG-SmBCO and VLS-SmBCO films had high-dislocation densities. We speculate that $J_{\text{c}}$ at low-magnetic fields is affected by dislocation density. LTG is effective for increasing dislocation density without deteriorating crystallinity or superconducting properties.
2006-07-25