Relationship between hole density and charge-ordering wave vector in Sr14−⁢Ca⁢Cu24⁢O41

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Erscheinungsjahr:
2007
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Text
Beschreibung:
  • The distribution of holes in Sr14−⁢Ca⁢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.
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  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH

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oai:www.edit.fis.uni-hamburg.de:publications/ff207fd7-a8b9-43b1-ad75-9108674e54fc