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

Abstract

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.

References in corpus (9)

• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
• Charge-ordering, commensurability and metallicity in the phase diagram of layered Na(x)CoO(2)
• Theory of Sodium Ordering in NaxCoO2
• 59Co NMR study of the Co states in superconducting and anhydrous cobaltates
• Charge ordering and magneto-polarons in Na${}_{0.82}$CoO${}_2$
• Unconventional Charge Ordering in Na0.70CoO2 below 300 K
• Revised superconducting phase diagram of hole doped Na${}_x$(H${}_3$O)${}_z$CoO${}_2\cdot y$H${}_2$O
• Structural transition in NaxCoO2 with x near 0.75 due to Na rearrangement
• Raman Phonons and Ageing-Related Surface Disorder in NaxCoO2

Cited by in corpus (6)

• Electronic texture of the thermoelectric oxide Na0.75CoO2
• Direct link between low temperature magnetism and high temperature sodium order in NaxCoO2
• X-ray absorption spectroscopy on layered cobaltates Na_xCoO_2
• Crystal-to-stripe reordering of sodium ions in NaxCoO2 (x>=0.75)
• Sodium Trimer Ordering on NaxCoO2 Surface
• Transition from a phase-segregated state to single-phase incommensurate sodium ordering in Na_xCoO_2 with x \approx 0.53