Physics – Condensed Matter – Superconductivity
Scientific paper
2002-05-16
Physics
Condensed Matter
Superconductivity
8 pages, 3 figures
Scientific paper
10.1103/PhysRevLett.89.277001
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.
Bernhard Christian
Boris A. V.
Dubroka Adam
Holden Tim
Keimer Bernhard
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