Strong Correlations Enhanced by Charge Ordering in Highly Doped Cobaltates

被引：17

作者：

Peil, Oleg E. ^{[1
]}

Georges, Antoine ^{[2
,3
,4
]}

Lechermann, Frank ^{[1
]}

机构：

[1] Univ Hamburg, Inst Theoret Phys, D-20355 Hamburg, Germany

[2] Ecole Polytech, CNRS, Ctr Phys Theor, F-91128 Palaiseau, France

[3] Coll France, F-75005 Paris, France

[4] Univ Geneva, DPMC, CH-1211 Geneva 4, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 23期

基金：

美国国家科学基金会;

关键词：

MEAN-FIELD THEORY; SUPERCONDUCTIVITY;

D O I：

10.1103/PhysRevLett.107.236404

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 kagome lattice.

引用

页数：5

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