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

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

2001-01-15

arxiv.org/abs/cond-mat/0101217v1

Physics

Condensed Matter

Superconductivity

6 pages, 6 figures

Scientific paper

10.1103/PhysRevB.64.064521

We observe a characteristic energy $\hbar\omega_{c}\approx 2.1$ eV which separates regions of different behavior of the phonon intensities in the Raman spectra of the $R\rm Ba_2Cu_3O_7$ 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 $\hbar\omega_c$. This intensity drop indicates an order parameter which affects energies in the vicinity of $\hbar\omega_c$.

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