Relationship between hole density and charge-ordering wave vector in Sr14-x Cax Cu24 O41

A. Rusydi, M. Berciu, P. Abbamonte, S. Smadici, H. Eisaki, Y. Fujimaki, S. Uchida, M. Rübhausen, G. A. Sawatzky

Research output: Contribution to journalArticlepeer-review

Abstract

The distribution of holes in Sr14-x Cax Cu24 O41 is revisited with semiempirical reanalysis of the x-ray absorption data and exact diagonalization cluster calculations. Another interpretation of the XAS data leads to much larger ladder hole densities than previously suggested. These new hole densities lead to a simple interpretation of the hole Wigner crystal recently reported with 1 3 and 1 5 wave vectors along the ladder. Our interpretation is consistent with paired holes in the rung of the ladders. Exact diagonalization results for a minimal model of the doped ladders suggest that the stabilization of spin structures consisting of 4 spins in a square plaquette as a result of resonance valence bond physics suppresses the hole crystal with a 1 4 wave vector.

Original languageEnglish (US)
Article number104510
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number10
DOIs
StatePublished - Mar 21 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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