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Investigation of microwave losses in superconducting liquid phase epitaxy Y0.7Yb0.3Ba2Cu3O7−δ films

Liquid phase epitaxy (LPE) is a prospective method for preparing high quality superconducting thick films, suitable for microwave application. In this paper, the microwave parameters of two selected LPE Y0.7Yb0.3Ba2Cu3O7−δ thick (∼3 µm) films on single crystal MgO substrates with 77 K critical current densities 0.6 MA cm−2 and 0.08 MA m−2 were investigated between 20 and 90 K and at 2.7 GHz and 9.2 GHz. The dependence of the impedance on the microwave power level was ascribed to the effect of the weak links in the samples, and some parameters of weak links were evaluated. Cleaning the surface with 0.1 vol% Br2 in methanol reduced the microwave losses for short etching times.