ISSN:
1573-7357
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1023/A:1022509920303
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