Stripe correlations in Na$_{0.75}$CoO$_2$

Details Stripe correlations in Na$_{0.75}$CoO$_2$ Stripe correlations in Na$_{0.75}$CoO$_2$

2005-11-22

arxiv.org/abs/cond-mat/0511554v1

Phys. Rev. Lett. 97, 106403 (2006)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.97.106403

We unambiguously demonstrate, based on high-energy x-ray diffraction data and LDA calculations, that sodium-density stripes are formed in Na0.75CoO2 at low temperatures and rule out the previously proposed Na-ordering models. The LDA calculations prove, that the sodium-density stripes lead to a sizeable 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 stripe-like charge correlations within the CoO2 layers, leading to an astonishing similarity between the doped cuprates and the NaxCoO2 compounds.

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