We consider the field dependence of the microwave resistivity in high-T-c superconductors. We present field-dependent microwave resistivity measurements at 48 GHz on thin YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+x films. The field dependence of the microwave resistivity cannot be satisfactorily described in terms of a single model for the flux motion when both materials are considered. We introduce and discuss a simple model that incorporates the effect of the enhanced field-induced quasiparticle increase in a superconductor with Lines of nodes in the gap, together with viscous flux motion. A good description of the data is obtained, for YBa2Cu3O7-delta as well as for Bi2Sr2CaCu2O8+x.
Silva, E., Fastampa, R., Giura, M., Marcon, R., Neri, D., Sarti, S. (2000). Microwave resistivity at 48 GHz in high-T-c superconductor films in magnetic fields. SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 13(8), 1186-1190 [10.1088/0953-2048/13/8/314].