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Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates | | A. Foussats
; A. Greco
; M. Bejas
; A. Muramatsu
; | | Date: |
12 Oct 2004 | | Journal: | Phys.Rev.B72,020504(R)(2005) | | Subject: | Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el | | Abstract: | We propose that unconventional superconductivity in hydrated sodium cobaltate $Na_xCoO_2$ results from an interplay of electronic correlations and electron-phonon interactions. 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 $x sim 0.35$. This picture is obtained for $V$ close to the critical Coulomb repulsion $V_c$ which separates the uniform Fermi liquid from $sqrt{3} imes sqrt{3}$ CDW ordered phase. | | Source: | arXiv, cond-mat/0410290 | | Services: | Forum | Review | PDF | Favorites | |
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