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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="…
The unoccupied electronic structure for the ${\mathrm{Sr}}_{14}{\mathrm{Cu}}_{24}{\mathrm{O}}_{41}$ family of two-leg ladder compounds was investigated for different partial substitutions of ${\mathrm{Sr}}^{2+}$ by ${\mathrm{Ca}}^{2+},$ leaving the nominal hole count constant, and by ${\mathrm{Y}}^{3+}$ or ${\mathrm{La}}^{3+},$ reducing the nominal hole count from its full value of 6 per formula unit. Using polarization-dependent x-ray …