Josephson plasma resonance and phonon anomalies in trilayer Bi2Sr2Ca2Cu3O10.
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 sizable 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.
Boris
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AV
Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Munzar
D
D
Kovaleva
N N
NN
Liang
B
B
Lin
C T
CT
Dubroka
A
A
Pimenov
A V
AV
Holden
T
T
Keimer
B
B
Mathis
Y-L
YL
Bernhard
C
C