Hole distribution in (Sr, Ca, Y, La) 14Cu24O41 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. EisakiS. Uchida, U. Ammerahl, A. Revcolevschi

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)14384-14392
Number of pages9
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number21
DOIs
Publication statusPublished - Dec 1 2000
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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