W. Walkenhorst et al., PROBING THE COLLECTIVE JOSEPHSON PLASMA RESONANCE IN BI2SR2CACU2O8-BAND-MIXING EXPERIMENTS(Y BY W), Physical review. B, Condensed matter, 56(13), 1997, pp. 8396-8403
We report on W-band-mixing experiments with mesa structures patterned
on top of Bi2Sr2CaCu2O8+y, single crystals. Due to the intrinsic Josep
hson effect the mixing process could be observed. There is a steep inc
rease of the mixing intensity when the bias current approaches the cri
tical current. We show that the mixing response is related to the exci
tation of the collective Josephson plasma resonance. In magnetic field
s we observed a decrease of the Josephson plasma frequency. From this
dependence we were able to estimate the frequency of the Josephson pla
sma resonance for zero bias and zero field ranging from 105 to 220 GHz
.