Berlin 2005 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 15: Superconductivity - Properties, Electronic Structure, Order Parameter I
TT 15.10: Vortrag
Samstag, 5. März 2005, 16:30–16:45, TU H2053
Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates — •A. Foussats1, A. Greco1, M. Bejas1, and A. Muramatsu2 — 1Facultad de Ciencias Exactas, Ingeniería y Agrimensura and Instituto de Física Rosario (UNR-CONICET). Av. Pellegrini 250-2000 Rosario, Argentina — 2Institut für Theoretische Physik III, Universität Stuttgart, 70550 Stuttgart, Germany
We propose that unconventional superconductivity in hydrated sodium cobaltate NaxCoO2 results from an interplay of electronic correlations and electron-phonon interactions [1]. On the basis of the t−V model plus phonons we found evidences for a) unconventional superconductivity, b) realistic values of Tc and c) the dome shape existing near x ∼ 0.35. This picture is obtained for V close to the critical Coulomb repulsion Vc which separates the uniform Fermi liquid from √3 × √3 CDW ordered phase.
[1] A. Foussats, A. Greco, M. Bejas, A. Muramatsu, cond-mat/0410290