Microstructure and electrical properties of YBCO thin films |
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| Authors: | Y H Li C Leach Yupu Li J A Kilner D Lacey A D Caplin R E Somekh |
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| Affiliation: | (1) Centre for High Temperature Superconductivity, Imperial College, SW7 2BP London, UK;(2) Interdisciplinary Research Centre in Superconductivity, University of Cambridge, CB2 3QZ Cambridge, UK |
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| Abstract: | Microstructures of c-axis oriented YBCO thin films made by high-pressure d.c. sputtering on LaAlO3 and MgO substrates were examined by TEM. The a-axis oriented grains, second phases and micro-twins were frequently observed in the film. The a-axis oriented grains expanded along their c-axis directions during film growth. The a- and b-axis misorientations were observed in the film on MgO due to serious lattice mis-match between YBCO and MgO. The second phases were often accompanied with a-axis oriented grains suggesting they act as nuclei. These observed results were correlated with the measured T
c and J
c of the films. |
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