Magnetic field dependence of the transverse plasmon in SmLa0.8Sr0.2CuO4-delta - art. no. 177003

The magnetic field and temperature dependence of the transverse and longitu dinal plasmons in SmLa0.8Sr0.2CuO4-delta have been investigated. A transiti on between a vortex-glass and a vortex-liquid regime, which revealed differ ent field dependencies of the resonance frequencies, could be clearly obser ved. The positions and the spectral weights of the plasmons were successful ly described using the multilayer model [Phys. Rev. B 64, 024530 (2001)], w hich takes the compressibility of the electronic liquid into account. The a bsolute value of the compressibility is close to that of a two-dimensional noninteracting electron gas.