Josephson plasma resonance and phonon anomalies in trilayer Bi_2Sr_2Ca_2Cu_3O_10 superconductor

Abstract

The far-infrared (FIR) c axis conductivity of a Bi2223 crystal has been measured by ellipsometry. Below T${}_c$ 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 CuO${}_2$ planes.

8 pages, 3 figures

References in corpus (2)

• Transverse optical Josephson plasmons, equations of motion
• Correlation between the Josephson coupling energy and the condensation energy in bilayer cuprate superconductors

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