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Phys. Rev. B 62, 14384–14392 (2000)

Hole distribution in (Sr,Ca,Y,La)14Cu24O41 ladder compounds studied by x-ray absorption spectroscopy

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N. Nücker, M. Merz, C. A. Kuntscher, S. Gerhold, and S. Schuppler
Forschungszentrum Karlsruhe, IFP, P.O. Box 3640, D-76021 Karlsruhe, Germany

R. Neudert*, M. S. Golden, and J. Fink
Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, D-01171 Dresden, Germany

D. Schild
Forschungszentrum Karlsruhe, INE, P.O. Box 3640, D-76021 Karlsruhe, Germany

S. Stadler, V. Chakarian, J. Freeland†, and Y. U. Idzerda
Naval Research Laboratory, Code 6345, Washington, DC 20375

K. Conder
Laboratorium für Festkörperphysik, ETH Zürich, CH-8093 Zürich, Switzerland

M. Uehara, T. Nagata, J. Goto, and J. Akimitsu
Department of Physics, Aoyama-Gakuin University, Chitosedai, Setagaya-ku, Tokyo 157-8572, Japan

N. Motoyama, H. Eisaki, and S. Uchida
Department of Superconductivity, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan

U. Ammerahl
Laboratoire de Physico-Chimie des Solides, Université de Paris-Sud, F-91405 Orsay Cedex, France
II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, D-50937 Köln, Germany

A. Revcolevschi
Laboratoire de Physico-Chimie des Solides, Université de Paris-Sud, F-91405 Orsay Cedex, France

Received 18 February 2000; published in the issue dated 1 December 2000

The unoccupied electronic structure for the Sr14Cu24O41 family of two-leg ladder compounds was investigated for different partial substitutions of Sr2+ by Ca2+, leaving the nominal hole count constant, and by Y3+ or La3+, reducing the nominal hole count from its full value of 6 per formula unit. Using polarization-dependent x-ray absorption spectroscopy on single crystals, hole states on both the chain and ladder sites could be studied. While for intermediate hole counts all holes reside on O sites of the chains, a partial hole occupation on the ladder sites in orbitals oriented along the legs is observed for the fully doped compound Sr14Cu24O41. On substitution of Ca for Sr orbitals within the ladder planes but perpendicular to the legs receive some hole occupation as well.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.62.14384
DOI:
10.1103/PhysRevB.62.14384
PACS:
74.25.Jb, 78.70.Dm, 74.72.Jt, 71.20.-b

*Present address: Robert Bosch GmbH, Center of Research and Development, P.O. Box 1342, D-72762 Reutlingen, Germany.

†Present address: Experimental Facilities Division, Argonne National Laboratory, Argonne, IL 60439.

 
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