Contrasting phonons with spin fluctuations in high-temperature superconductors: kinks and d-wave pairing

Datum

05.05.2011

Zeit

11:00 - 13:00

Sprecher

Dirk Manske

Sprache

en

Hauptthema

Physik

Andere Themen

Physik

Host

joint seminar of CPfS und PKS

Beschreibung

Despite of more than 20 years of intense research the relevance of spin fluctuations and phonons for the pairing mechanism and the low-energy properties of high-temperature superconductors is presently rather controversially discussed. In this talk I review the status of this discussion and contrast both mechanisms which should leave fingerprints in the elementary excitations that can be compared with experiment. For example, a spin-fluctuation-mediated pairing leads to (a) strong kinks in the electronic dispersion, (b) to a resonance (feedback) excitation in the spin susceptibility, and (c) straightforward to d-wave pairing. On the other hand, for the phonon case, one finds that the contribution of the electron-phonon interaction for d-wave pairing λd is one order of magnitude smaller than the already small isotropic s-wave channel λs. Finally, I draw an outlook on future key experiments to search for the pairing mechanism.

Letztmalig verändert: 05.05.2011, 09:35:23