Stripe correlations in Na0.75CoO2

被引：19

作者：

Geck, J.

Zimmermann, M. v.

Berger, H.

Borisenko, S. V.

Eschrig, H.

Koepernik, K.

Knupfer, M.

Buechner, B.

机构：

[1] IFW Dresden, Leibniz Inst Solid State & Mat Res, D-01069 Dresden, Germany

[2] DESY, Hamburger Synchrontronstschlungslabor HASYLAB, D-22603 Hamburg, Germany

[3] Ecole Polytech Fed Lausanne, IPMC, CH-1015 Lausanne, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 10期

关键词：

D O I：

10.1103/PhysRevLett.97.106403

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a combined high-energy x-ray diffraction and local-density approximation study of the sodium ordering in Na0.75CoO2. The obtained results rule out previously proposed Na-ordering models and provide strong evidence for the formation of sodium-density stripes in this material. The local-density approximation calculations prove that the sodium-density stripes lead to a sizable dip in the density of the Co states at the Fermi level, pointing to band structure effects as a driving force for the stripe formation. This indicates that the sodium ordering is connected to stripelike charge correlations within the CoO2 layers, leading to an astonishing similarity between the doped cuprates and the NaxCoO2 compounds.

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页数：4

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