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16 April 2024

» arxiv » cond-mat/0008320

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Hole distribution for (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 ; A. Revcolevschi ;
Date:	22 Aug 2000
Subject:	Strongly Correlated Electrons; Superconductivity \| cond-mat.str-el cond-mat.supr-con
Abstract:	The unoccupied electronic structure for the Sr_14Cu_24O_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_14Cu_24O_41. On substitution of Ca for Sr orbitals within the ladder planes but perpendicular to the legs receive some hole occupation as well.
Source:	arXiv, cond-mat/0008320
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