Microstructures and Superconductivities of LnBa2Cu3O7-x Thin Films
YBa2Cu3O7-x and ErBa2Cu3O7-x thin films are deposited on SrTiO3 and MgO single crystal substrates by rf-magnetron sputtering. YBa2Cu3Ob-x film is grown epitaxially on SrTiO3 substrate. ErBa2Cu3O7-x film is highly c-axis oriented perpendicular to MgO substrate. A lot of twins on a-b plane are observed by TEM. Jc seems to be affected by the subgrain defects rather than by the twin defects. The critical current dependency on the direction of applied magnetic field is also studied. Twin boundaries are thought not to be strong pinning centers of magnetic flux. Crystallographic anisotropy of oxygen-defect perovskite contributes to flux pinning.
KeywordsBasal Plane Oxide Superconductor Flux Pinning Ceramic Superconductor Crystallographic Anisotropy
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