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Proceedings Paper

Raman spectral temperature dependence of Bi2Sr2Ca1-x(Yx)Cu2O8 (x = 0 and 1)
Author(s): Eric Faulques; V. Perocheau; B. Corraze; Helmuth Berger
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Paper Abstract

We have investigated the temperature dependence of phonon and magnon Raman scattering of Bi2Sr2CaCu2O8 (2212) and Bi2Sr2YCu2O8 single crystals. We found no significant frequency shifts above and below Tc nor magnons in the yttrium free 2212 compound. The main 460 cm-1 O-Sr phonon is not coupled to an electronic continuum whereas it appears clearly that the 630 cm-1 O-Bi phonon does couple owing to its Fano shape. The issue is whether the oxygen-CuO2 290 cm-1 phonon couples remain open or not. On the contrary, some phonons of the Raman spectra of yttrium 2212 crystals show changes around T* equals 125 K in frequency, linewidth and intensity. For instance, anomalous temperature dependence is evidenced for the frequency and linewidth of the O-Bi lines (628, 670 cm-1) and CuO2 lines (310, 358 cm-1), and the linewidth of the mode at 500 cm-1. A strong and large feature (3060 cm-1) stemming possibly from two-magnon scattering has also been recorded at 8 K and 300 K. The exchange integral J is estimated to be minus 140 meV.

Paper Details

Date Published: 10 June 1996
PDF: 11 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241778
Show Author Affiliations
Eric Faulques, Institut des Materiaux de Nantes (France)
V. Perocheau, Institut des Materiaux de Nantes (France)
B. Corraze, Institut des Materiaux de Nantes (France)
Helmuth Berger, Ecole Polytechnique Federale de Lausanne (France)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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