Hole-depletion of ladders in Sr₁₄Cu₂₄O₄₁ induced by correlation effects
Ilakovac, V. · Gougoussis, C. · Calandra, M. · Brookes, N. B. · Bisogni, V. · Chiuzbaian, S. G. · Akimitsu, J. · Milat, O. · Tomić, S. · Hague, C. F.
Original · EN
The hole distribution in Sr₁₄Cu₂₄O₄₁ is studied by low temperature polarization dependent O K Near-Edge X-ray Absorption Fine Structure measurements and state of the art electronic structure calculations that include core-hole and correlation effects in a mean-field approach. Contrary to all previous analysis, based on semi-empirical models, we show that correlations and antiferromagnetic ordering favor the strong chain hole-attraction. For the remaining small number of holes accommodated on ladders, leg-sites are preferred to rung-sites. The small hole affinity of rung-sites explains naturally the 1D - 2D cross-over in the phase diagram of (La,Y,Sr,Ca)₁₄Cu₂₄O₄₁
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