Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 16: Mechanismus der HTSL

TT 16.5: Fachvortrag

Donnerstag, 27. März 2003, 11:15–11:40, HSZ304

Generalized Eliashberg theory for hole- and electron-doped cuprates:elementary excitations and resonance peak — •Dirk Manske — Institut fuer Theoretische Physik, Freie Universitaet Berlin

Elementary excitations in the high-Tc cuprates are of central interest in order to learn more about the electronic correlations and the pairing mechanism for superconductivity. In this talk we focus on recent experimental and theoretical work on the kink feature and resonance peak and their possible interpretations due to phonons and spin fluctuations [1-4]. Furthermore, the doping dependence of the elementary excitations will be analyzed. Although the phase diagram of hole- and electron-doped cuprates reveal some similarities [5,6], both effects seem to be present only in hole-doped cuprates, but not in electron-doped ones. The kink feature and resonance peak are also related to tunneling experiments and measurements of the optical conductivity and shed important light on the essential ingredients a theory for Cooper-pairing in the cuprates must contain.

[1] see, for example, A. Lanzara et al., Nature 412, 510 (2001) [2] H.F. Fong et al., PRB 54, 6708; Ph. Bourges et al., Science 288, 1234 (2000) [3] D. Manske, I. Eremin, and K.H. Bennemann, PRB 63, 054517 (2001) [4] D. Manske, I. Eremin, and K.H. Bennemann, PRL 87, 177005 (2001) [5] D. Manske, T. Dahm, and K.H. Bennemann, PRB 64, 144520 (2001) [6] D. Manske, I. Eremin, and K.H. Bennemann, PRB 63, 13922 (2000)