Epitaxial YBa2Cu3O7−δ thin films grown by laser ablation on MgO (100) substrates were investigated for microwave applications. By systematically varying the growth conditions, we obtained films with various microstructures, low-frequency superconducting properties, and microwave performance. The surface resistances were determined from a measured unloaded quality factor in a 8.6-GHz microstrip resonator. Surface resistance was found to correlate most directly with the degree of grain alignment as revealed by electron channeling and x-ray diffraction studies. Films grown at optimal conditions gave a scaled surface resistance of 0.6 mΩ at 77 K and 10 GHz.
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Young et al. (1991) studied this question.
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