Hole distribution in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mo>(</mo><mi mathvariant="normal">Sr</mi><mo>,</mo><mi mathvariant="normal">Ca</mi><mo>,</mo><mi mathvariant="normal">Y</mi><mo>,</mo><mi mathvariant="normal">La</mi><mrow><msub><mrow><mo>)</mo></mrow><mrow><mn>14</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Cu</mi></mrow><mrow><mn>24</mn></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">O</mi></mrow><mrow><mn>41</mn></mrow></msub></mrow></math></span> ladder compounds studied by x-ray absorption spectroscopy

N. Nücker; M. Merz; C. A. Kuntscher; S. Gerhold; S. Schuppler; R. Neudert; M. S. Golden; J. Fink; D. Schild; S. Stadler; V. Chakarian; J. Freeland; Y. U. Idzerda; K. Conder; M. Uehara; T. Nagata; J. Goto; J. Akimitsu; N. Motoyama; H. Eisaki; S. Uchida; U. Ammerahl; A. Revcolevschi

doi:10.1103/PhysRevB.62.14384

Hole distribution in $(Sr, Ca, Y, La)_{14} {Cu}_{24} O_{41}$ ladder compounds studied by x-ray absorption spectroscopy

N. Nücker, M. Merz, C. A. Kuntscher, S. Gerhold, S. Schuppler, R. Neudert, M. S. Golden, J. Fink, D. Schild, S. Stadler, V. Chakarian, J. Freeland, Y. U. Idzerda, K. Conder, M. Uehara, T. Nagata, J. Goto, J. Akimitsu, N. Motoyama, H. Eisaki, S. Uchida, U. Ammerahl, and A. Revcolevschi

Phys. Rev. B 62, 14384 – Published 1 December 2000

Abstract

The unoccupied electronic structure for the ${Sr}_{14} {Cu}_{24} O_{41}$ family of two-leg ladder compounds was investigated for different partial substitutions of ${Sr}^{2 +}$ by ${Ca}^{2 +},$ leaving the nominal hole count constant, and by $Y^{3 +}$ or ${La}^{3 +},$ 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 ${Sr}_{14} {Cu}_{24} O_{41} .$ On substitution of Ca for Sr orbitals within the ladder planes but perpendicular to the legs receive some hole occupation as well.

Received 18 February 2000

DOI:https://doi.org/10.1103/PhysRevB.62.14384

Authors & Affiliations

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

^*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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Vol. 62, Iss. 21 — 1 December 2000

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