Direct-current-assisted microwave quenching of YBa2Cu3O7−δ coplanar waveguide to a highly dissipative state

The paper reports on revealing the effect of a strong change in the microwave losses in an high-temperature superconductor (HTS)-based coplanar waveguide (CPW) at certain values of the input power Pin and direct current Idc. CPW on the basis of 150 nm thick YBa2Cu3O7−δ epitaxial film on a single crystal MgO substrate was studied experimentally. A sharp and reversible transition of the CPW into a strongly dissipative state at the certain values of Pin and Idc depending on temperature were observed. Apparently, the effect can be explained by self-heating of HTS structure caused by magnetic flux flow under the joint influence of microwave field and direct current.