Epitaxial YBa/sub 2/Cu/sub 3/O/sub 7- delta / thin films on LaMgAl/sub 11/O/sub 19/: new substrates with low dielectric losses

Pulsed laser ablation was used to deposit superconducting YBa/sub 2/Cu/sub 3/O/sub 7- delta / thin films with T/sub c/=89.5 K on an LaMgAl/sub 11/O/sub 19/ substrate. X-ray diffraction patterns show that the YBa/sub 2/Cu/sub 3/O/sub 7- delta / films were epitaxially grown with their c-axis perpendicular to the substrate surface. LaMgAl/sub 11/O/sub 19/ has low dielectric constant and small loss tangent. Using the LaMgAl/sub 11/O/sub 19/ substrates, YBa/sub 2/Cu/sub 3/O/sub 7- delta / microstrip resonators were fabricated.<
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