Origin of anomalous bump at low temperatures in the c-axis optical conductivity of high-{Tc} cuprates
The optical spectra of some high-Tc cuprates show anomalous bump around 450 cm{sup {minus}1} and dramatic phonon changes for E parallel to c axis, which grows at low temperatures. This phenomenon has been observed in YBa{sub 2}Cu{sub 3}O{sub 6.6}, YBa{sub 2}Cu{sup 4}O{sub 8} and Pb{sub 2}Sr{sub 2}RCu{sub 3}O{sub 8}, but not in (La,Sr){sub 2}CuO{sub 4}. In this study, the authors report the first observation of a similar anomaly in underdoped Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8}. The spectra were measured from two mosaics of Ba{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8} with {Tc} 80 K and 60 K. Considering that these spectral features seem to be common for all high-{Tc} cuprates with double CuO pyramids, they propose one plausible explanation that it is attributed to the second Josephson plasmon for intracell coupling in the Josephson coupled layer model.
- Research Organization:
- ISTEC, Tokyo (JP)
- OSTI ID:
- 20015265
- Journal Information:
- Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 117; ISSN JLTPAC; ISSN 0022-2291
- Country of Publication:
- United States
- Language:
- English
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