Superconductivity-induced changes of the phonon resonances in RBa_2Cu_3O_7 (R=rare earth)

Abstract

We observe a characteristic energy $\hslash {\omega }_c\approx 2.1$ eV which separates regions of different behavior of the phonon intensities in the Raman spectra of the $R\mathrm{B}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_7$ system. A superconductivity-induced drop of phonon intensities is found for the oxygen modes O(4) and O(2)-O(3) only for excitation energies below $\hslash {\omega }_c$. This intensity drop indicates an order parameter which affects energies in the vicinity of $\hslash {\omega }_c$.

6 pages, 6 figures

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