Okc. Tsui et al., SHARP MAGNETOABSORPTION RESONANCES IN THE VORTEX STATE OF BI2SR2CACU2O8+DELTA, Physica. C, Superconductivity, 235, 1994, pp. 1997-1998
We have observed sharp resonances in the absorption of microwave radia
tion (30 to 50 GHz) in the vortex state of Bi2Sr2CaCu2O8+delta. The un
usual dispersion strongly coupled to the vortex lattice.