Berlin 2005 – scientific programme

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TT: Tiefe Temperaturen

TT 15: Superconductivity - Properties, Electronic Structure, Order Parameter I

TT 15.10: Talk

Saturday, March 5, 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 Na_xCoO₂ 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 T_c and c) the dome shape existing near x ∼ 0.35. This picture is obtained for V close to the critical Coulomb repulsion V_c which separates the uniform Fermi liquid from √3 × √3 CDW ordered phase.

[1] A. Foussats, A. Greco, M. Bejas, A. Muramatsu, cond-mat/0410290