The resistance anomaly in the surface layer of Bi 2 Sr 2 CaCu 2 O 8+x single crystals under radio-frequency irradiation
Abstract
We observed that radio-frequency (rf) irradiation significantly enhances the
c
-axis resistance near and below the superconducting transition of the CuO
2
layer in contact with a normal-metal electrode on the surface of Bi
2
Sr
2
CaCu
2
O
8+x
single crystals. We attribute the resistance anomaly to the rf-induced charge-imbalance nonequilibrium effect in the surface CuO
2
layer. The relaxation of the charge-imbalance in this highly anisotropic system is impeded by the slow quasiparticle recombination rate, which results in the observed excessive resistance.