Josephson plasma resonance and phonon anomalies in trilayer Bi2Sr2Ca2Cu3O10 superconductor
Abstract
The far-infrared (FIR) c axis conductivity of a Bi2223 crystal has been measured by ellipsometry. Below Tc a strong absorption band develops near 500 cm -1, corresponding to a transverse Josephson-plasmon. The related increase in FIR spectral weight leads to a giant violation of the Ferrell-Glover-Tinkham sum-rule. The gain in c axis kinetic energy accounts for a sizeable part of the condensation energy. We also observe phonon anomalies which suggest that the Josephson-currents lead to a drastic variation of the local electric field within the block of closely spaced CuO2 planes.
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