Strong correlations enhanced by charge-ordering in highly doped cobaltates

Details Strong correlations enhanced by charge-ordering in highly doped cobaltates Strong correlations enhanced by charge-ordering in highly doped cobaltates

2011-07-21

arxiv.org/abs/1107.4374v2

Phys. Rev. Lett. 107, 236404 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

4+ pages, 3 figures

Scientific paper

10.1103/PhysRevLett.107.236404

We present an explanation for the puzzling spectral and transport properties of layered cobaltates close to the band-insulator limit, which relies on the key effect of charge ordering. Blocking a significant fraction of the lattice sites deeply modifies the electronic structure in a way that is shown to be quantitatively consistent with photoemission experiments. It also makes the system highly sensitive to interactions (especially to intersite ones), hence accounting for the strong correlations effects observed in this regime, such as the high effective mass and quasiparticle scattering rate. These conclusions are supported by a theoretical study of an extended Hubbard model with a realistic band structure on an effective kagom\`e lattice.

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