ISSN:
1434-6036
Keywords:
PACS. 74.25.Gz Optical properties - 74.62.Dh Effects of crystal defects, doping and substitution - 74.72.Bk Y-based cuprates
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We report on the temperature dependence of the frequencies and linewidths in the phonon Raman scattering for Y 1-y Ca y Ba 2 Cu 4 O 8 system ( y = 0 - 0.15). The phonon anomalies above T c of the frequencies are observed for the out-of-phase O(2)-O(3) A g and O(4) A g modes, and these onset temperatures decrease with increasing Ca content. These features are consistent with the spin-gap behaviors associated with Ca doping reported previously. Furthermore, we find that the smaller gap exists near or just above the Ba phonon frequency at in the undoped samples and its energy increases with Ca doping.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/PL00011033
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