Origin of Anomalous Bump at Low Temperatures in the c-Axis Optical Conductivity of High-Tc Cuprates

被引：0
|
作者：
V. Železný
S. Tajima
T. Motohashi
J. Shimoyama
K. Kishio
D. van der Marel
机构：
[1] ISTEC,Superconductivity Research Laboratory
[2] ASCR,Institute of Physics
[3] The University of Tokyo,Dept. of Applied Chem
[4] University of Groningen,Lab. of Sol. St. Phys.
来源：
Journal of Low Temperature Physics | 1999年 / 117卷
关键词：
Pyramid; Magnetic Material; Spectral Feature; Optical Spectrum; Layer Model;
D O I：
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中图分类号：
学科分类号：
摘要：
The optical spectra of some high-Tc cuprates show anomalous bump around 450 cm−1and dramatic phonon changes for E parallel to c axis, which grows at low temperatures. This phenomenon has been observed in Yba2Cu3O6.6, YBa2Cu4O8and Pb2Sr2RCu3O8, but not in (La,Sr)2CuO4. In this study, we report the first observation of a similar anomaly in underdoped Bi2Sr2CaCu2O8. The spectra were measured from two mosaics of Ba2Sr2CaCu2O8with Tc80 K and 60 K. Considering that these spectral features seem to be common for all high-Tccuprates with double CuO pyramids, we propose one plausible explanation that it is attributed to the second Josephson plasmon for intracell coupling in the Josephson coupled layer model.
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页码：1019 / 1023
页数：4
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