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

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Abstract

The optical spectra of some high-Tc cuprates show anomalous bump around 450 cm −1 and dramatic phonon changes for E parallel to c axis, which grows at low temperatures. This phenomenon has been observed in Yba 2 Cu 3 O 6.6, YBa 2 Cu 4 O 8 and Pb 2 Sr 2 RCu 3 O 8 , but not in (La,Sr) 2 CuO 4. In this study, we report the first observation of a similar anomaly in underdoped Bi 2 Sr 2 CaCu 2 O 8. The spectra were measured from two mosaics of Ba 2 Sr 2 CaCu 2 O 8 with T c 80 K and 60 K. Considering that these spectral features seem to be common for all high-T c cuprates 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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Author notes

  1. V. Železný

    Present address: Institute of Physics, ASCR, Praha, Czech Republic

Authors and Affiliations

  1. Superconductivity Research Laboratory, ISTEC, Tokyo, 135-0082, Japan

    V. Železný

  2. Dept. of Applied Chem, The University of Tokyo, Tokyo, 113, Japan

    S. Tajima, T. Motohashi, J. Shimoyama & K. Kishio

  3. Lab. of Sol. St. Phys., University of Groningen, The Netherlands

    D. van der Marel

Authors
  1. V. Železný
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  2. S. Tajima
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  3. T. Motohashi
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  4. J. Shimoyama
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  5. K. Kishio
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  6. D. van der Marel
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Železný, V., Tajima, S., Motohashi, T. et al. Origin of Anomalous Bump at Low Temperatures in the c-Axis Optical Conductivity of High-T c Cuprates. Journal of Low Temperature Physics 117, 1019–1023 (1999). https://doi.org/10.1023/A:1022509920303

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  • DOI: https://doi.org/10.1023/A:1022509920303

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