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Hole distribution for (Sr,Ca,Y,La)_14 Cu_24 O_41 ladder compounds studied by x-ray absorption spectroscopy

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arxiv cond-mat/0008320 v1 pith:FOTE4X3P submitted 2000-08-22 cond-mat.str-el cond-mat.supr-con

N. Nücker , M. Merz , C. A. Kuntscher , S. Gerhold , S. Schuppler , R. Neudert , M. S. Golden , J. Fink
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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
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classification cond-mat.str-elcond-mat.supr-con
keywords holeladdersitesabsorptioncompoundscountlegsnominal
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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