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Phys. Rev. B 67, 024516 (2003) [5 pages]

Unusual electronic structure of the pseudoladder compound CaCu2O3

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T. K. Kim1, H. Rosner1,2,*, S.-L. Drechsler1, Z. Hu1,†, C. Sekar1, G. Krabbes1, J. Málek1,‡, M. Knupfer1, J. Fink1, and H. Eschrig1
1Leibniz-Institute for Solid State and Materials Research Dresden, P.O. Box 270116, D-01171 Dresden, Germany
2Department of Physics, University of California, Davis, California 95616

Received 8 August 2002; published 29 January 2003

Experimental and theoretical studies of the unoccupied electronic structure of CaCu2O3 single crystals have been performed using polarization-dependent x-ray absorption spectroscopy and band-structure calculations. The measured hole distribution shows an unusual large number of holes in orbitals parallel to the interlayer direction which is in agreement with the theoretical analysis. CaCu2O3 deviates significantly from the standard pdσ cuprate picture. The corresponding strong interlayer exchange is responsible for the missing spin gap which is generic for other two-leg ladder cuprates.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.67.024516
DOI:
10.1103/PhysRevB.67.024516
PACS:
71.27.+a

*Corresponding author, Email address: helge@maugre.ucdavis.edu Present address: Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, D-01187 Dresden, Germany.

†Present address: II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.

‡On leave from Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague, Czech Republic.

 
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