Bosonic spectral function and the electron-phonon interaction in HTSC cuprates
- In this paper we discuss experimental evidence related to the structure and origin of the bosonic spectral function alpha 2F (omega) in high-temperature superconducting (HTSC) cuprates at and near optimal doping. Global properties of alpha 2F (omega), such as number and positions of peaks, are extracted by combining optics, neutron scattering, ARPES and tunnelling measurements. These methods give evidence for strong electron-phonon interaction (EPI) with 1<lambda ep <~ 3.5 in cuprates near optimal doping. We clarify how these results are in favor of the modified Migdal-Eliashberg (ME) theory for HTSC cuprates near optimal doping. In Section 2 we discuss theoretical ingredients—such as strong EPI, strong correlations—which are necessary to explain the mechanism of d-wave pairing in optimally doped cuprates. These comprise the ME theory for EPI in strongly correlated systems which give rise to the forward scattering peak. The latter is supported by the long-range part of EPI due to the weakly screened Madelung interaction in the ionic-metallic structure of layered HTSC cuprates. In this approach EPI is responsible for the strength of pairing while the residual Coulomb interaction and spin fluctuations trigger the d-wave pairing.
| Author: | Evgeny G. Maksimov, Miodrag L. Kulic, Oleg V. Dolgov |
|---|---|
| URN: | urn:nbn:de:hebis:30-83070 |
| DOI: | https://doi.org/10.1155/2010/423725 |
| ISSN: | 1687-8124 |
| ISSN: | 1687-8108 |
| ArXiv Id: | http://arxiv.org/abs/1001.4859 |
| Parent Title (English): | Advances in condensed matter physics |
| Publisher: | Hindawi Publ. Corp. |
| Place of publication: | New York, NY [u.a.] |
| Document Type: | Article |
| Language: | English |
| Date of Publication (online): | 2010/10/22 |
| Year of first Publication: | 2010 |
| Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
| Release Date: | 2010/10/22 |
| Volume: | 2010 (2010) |
| Issue: | Article ID 423725 |
| Page Number: | 64 |
| First Page: | 1 |
| Last Page: | 64 |
| Note: | Copyright © 2010 E. G. Maksimov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
| HeBIS-PPN: | 229611885 |
| Institutes: | Physik / Physik |
| Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
| Sammlungen: | Universitätspublikationen |
| Licence (German): |  Creative Commons - Namensnennung 3.0 |
