Collective excitations in superconductors |
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| Authors: | Gerhart Lüders Klaus Brandt |
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| Affiliation: | 1. Institut für Theoretische Physik der Universit?t G?ttingen, Deutschland
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| Abstract: | The excitations connected with quantum condensation of a fermion gas are calculated quantitatively along the lines of a previous paper. We find exact agreement with earlier results: excitations of the phonon type in the absence of Coulomb interaction, strong indications for their nonexistence in the presence of this interaction. |
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