Strong changes in the phonon spectra of 123 superconductors by varying oxygen concentration |
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| Authors: | B Renker F Gompf E Gering D Ewert H Rietschel A Dianoux |
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| Institution: | (1) Institut für Nukleare Festkörperphysik, Kernforschungszentrum Karlsruhe, Postfach 3640, D-7500 Karlsruhe 1, Federal Republic of Germany;(2) Institut Laue-Langevin, 56X, F-38042 Grenoble, France |
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| Abstract: | By means of inelastic neutron scattering we have studied the phonon densities of states (PDOS) ofY based 123 superconductors with oxygen concentrations varying between O7 and O6. We find drastic changes in the PDOS above 40 meV which develop in a systematic manner if we switch from superconducting to semiconducting samples. Model calculations clearly show that this cannot be explained solely by structural changes but is likely to reflect strong differences in the electron-phonon coupling. |
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