HASTREITER, G and STRAUCH, D and KELLER, J and SCHMID, B and SCHRODER, U (1992) RENORMALIZATION OF PHONON FREQUENCIES BY CONDUCTION ELECTRONS IN LAYER SYSTEMS WITH APPLICATION TO YBA2CU3O7. ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 89 (2). pp. 129-138. ISSN 0722-3277,
Full text not available from this repository.Abstract
It is generally assumed that there are free electronic carriers associated with the CuO2 planes in high-temperature superconductors. Regarding these carriers as confined to these planes their influence on phonon frequencies is studied within the framework of a shell model of lattice dynamics taking into account the long-range part of the electron-phonon coupling. We find a complete suppression of the LO-TO splitting for modes polarized along the planes by metallic screening and a strong coupling of electronic plasmon and particle-hole excitations especially to some TO-phonon branches polarized perpendicular to the conducting planes, particularly pronounced in systems with at least two CuO2 planes per unit cell. Numerical results are presented for YBa2Cu3O7.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | HIGH-TEMPERATURE SUPERCONDUCTORS; INFRARED-ACTIVE PHONONS; OXIDE SUPERCONDUCTORS; TRANSITION-METALS; LATTICE-DYNAMICS; SELF-ENERGIES; LA2NIO4; ANOMALIES; PLASMONS; RANGE; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:44 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54326 |
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