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The unoccupied electronic structure for the Sr_14Cu_24O_41 family of two-legladder 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 forintermediate hole counts all holes reside on O sites of the chains, a partialhole occupation on the ladder sites in orbitals oriented along the legs isobserved for the fully doped compound Sr_14Cu_24O_41. On substitution of Ca forSr orbitals within the ladder planes but perpendicular to the legs receive somehole occupation as well.

physical review. b, condensed matter

Hole distribution in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi mathvariant="normal">Sr</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Ca</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">Y</mml:mi><mml:mo>,</mml:mo><mml:mi mathvariant="normal">La</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="…

Hole distribution in(Sr,Ca,Y,La)14