Raman spectral temperature dependence of Bi2Sr2Ca1-x(Yx)Cu2O8 (x = 0 and 1)

Eric Faulques; V. Perocheau; B. Corraze; Helmuth Berger

doi:10.1117/12.241778

10 June 1996 Raman spectral temperature dependence of Bi₂Sr₂CaCu₂O₈ (x = 0 and 1)

Eric Faulques, V. Perocheau, B. Corraze, Helmuth Berger

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241778
Event: Photonics West '96, 1996, San Jose, CA, United States

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 T_c 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.

Citation Download Citation

Eric Faulques, V. Perocheau, B. Corraze, and Helmuth Berger "Raman spectral temperature dependence of Bi₂Sr₂CaCu₂O₈ (x = 0 and 1)", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241778

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