Sergeev, A. and Preis, Ch. and Keller, J. (2000) Phonon self-energy in superconductors: Effect of vibrating impurities. PHYSICAL REVIEW B, 62 (9). pp. 5896-5903. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
The phonon self-energy due to the interaction with electrons is studied for superconductors with s- and d-wave pairing. Addition of impurities not only changes the electronic states, but it also generates a channel of the electron-phonon interaction due to electron scattering from vibrating impurities. Impurity-induced electron-phonon coupling results in significant modifications of the phonon self-energy. For a d-wave superconductor the phonon attenuation coefficient (the imaginary part of the phonon self-energy) has been calculated in the Born approximation and in the unitary limit for electron-impurity scattering. In the case of weak electron-impurity potential, the attenuation decreases if temperature reduces below T-c, while an increase of the attenuation in the superconducting state has been found in the unitary limit. The theory shows a good agreement with measured disorder-dependent coupling of the B-1g phonon mode to superconducting electrons in high-T-c samples: the Born approximation well describes temperature dependence of the attenuation in YBaCuO single crystals, the unitary limit corresponds to polycrystals and twinned crystals.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HIGH-TC SUPERCONDUCTORS; GAP; SCATTERING; SYMMETRY; YBA2CU3O7-DELTA; DEPENDENCE; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 28 Mar 2022 14:31 |
| Last Modified: | 28 Mar 2022 14:31 |
| URI: | https://pred.uni-regensburg.de/id/eprint/42253 |
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