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Phys. Rev. B 75, 104510 (2007) [5 pages]

Relationship between hole density and charge-ordering wave vector in Sr14−xCaxCu24O41

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A. Rusydi1,2,3, M. Berciu4, P. Abbamonte1,5, S. Smadici1,5, H. Eisaki6, Y. Fujimaki7, S. Uchida7, M. Rübhausen3, and G. A. Sawatzky4
1National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973-5000, USA
2Materials Science Centre, University of Groningen, 9747 AG Groningen, The Netherlands
3Institut für Angewandte Physik, Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany
4Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T-1Z1, Canada
5Physics Department and Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA
6Nanoelectronics Research Institute, AIST, 1-1-1 Central 2, Umezono, Tsukuba, Ibaraki 305-8568, Japan
7Department of Superconductivity, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan

Received 20 October 2006; published 21 March 2007

The distribution of holes in Sr14−xCaxCu24O41 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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.104510
DOI:
10.1103/PhysRevB.75.104510
PACS:
74.25.Jb, 71.10.Li, 73.20.Qt, 78.70.Dm
 
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