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The unusual electronic structure of the "pseudo-ladder" compound CaCu2O3

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arxiv cond-mat/0208180 v1 pith:SE6QD6UZ submitted 2002-08-08 cond-mat.str-el

The unusual electronic structure of the "pseudo-ladder" compound CaCu2O3

classification cond-mat.str-el
keywords cacu2o3structureelectronicinterlayertheoreticalunusualabsorptionagreement
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Experimental and theoretical studies of the unoccupied electronic structure of CaCu2O3 single crystals have been performed using polarization-dependent x-ray absorption spectroscopy and band structure calculations. The measured hole distribution shows an unusual large number of holes in orbitals parallel to the interlayer direction which is in agreement with the theoretical analysis. CaCu2O3 deviates significantly from the standard pd-sigma cuprate picture. The corresponding strong interlayer exchange is responsible for the missing spin gap generic for other two-leg ladder cuprates.

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