Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates

2004/10/31 by A. Foussats, A. Greco, M. Bejas +2 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Coulomb #Electron #Magnetic and transport properties of perovskites and related materials #Phase (matter) #Phonon #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Superconductivity #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.72.020504

published as Phys.Rev.B72,020504(R)(2005) · 4 pages, 3 figures

openalex publication_date 2005/07/15 · arxiv created 2005/07/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We propose that unconventional superconductivity in hydrated sodium cobaltate Na_xCoO₂ results from an interplay of electronic correlations and electron-phonon interactions. On the basis of the t\ensuremath-V model plus phonons we found evidence for (a) unconventional superconductivity, (b) realistic values of T_c, and (c) the dome shape existing near x\ensuremath∼0.35. This picture is obtained for V close to the critical Coulomb repulsion V_c, which separates the uniform Fermi liquid from √(3)\ifmmode×\else\texttimes\fi√(3) charge-density-wave-ordered phase.

Citations

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• Superconductivity in NaxCoO2·yH2O due to Charge Fluctuation
• Optical conductivity of single crystals ofNa0.57CoO2
• First-principles lattice dynamics ofNaCoO2
• Income Distributions from Other Sources than Income Tax Returns
• Infrared Probe of the Electronic Structure and Charge Dynamics ofNa0.7CoO2
• Superconductivity inCoO2layers and the resonating valence bond mean-field theory of the triangular latticet−Jmodel
• ARPES onNa0.6CoO2: Fermi Surface and Unusual Band Dispersion
• Unconventional Superconductivity and Electron Correlations in the Cobalt OxyhydrateNa0.35CoO2·yH2Ofrom Nuclear Quadrupole Resonance
• Dopedt−Jmodel on a triangular lattice: Possible application toNaxCoO2⋅yH2OandNa1−xTiO2
• Electron correlations in narrow energy bands
• 1. 幼児期における読み書き能力の獲得過程とその環境要因の影響に関する国際比較研究(国際的格差領域)
• Role of Hybridization inNaxCoO2and the Effect of Hydration

Cited by

• Electron–Phonon Mechanism for Superconductivity in Na0.35CoO2: Valence-Band Suhl–Kondo Effect Driven by Shear Phonons