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VOLUME 80 (2004) | ISSUE 11 | PAGE 819
Strong spin triplet contribution of the first removal state in the insulating regime of Bi2Sr2Ca1- xYxCu2O8+δ
PACS: 73.20.At, 74.25.Jb, 74.62.Dh, 79.60.Bm
Abstract
The experimental dispersion of the first removal state in the insulating Bi2Sr2Ca1-xYxCu2O8+δ regime of is found to differ significantly from that of other parent materials: oxyclorides and  La2CuO4. For Y-contents of 0.92\geq x \geq0.55 due to nonstoichiometric effects in the Bi- O layers, the hole concentration in the CuO2-layers is almost constant and on the contrary the crystal lattice parameters a,b,c change very strongly. This (a,b) parameter increase and c parameter decrease results in an unconventional three peak structure at (0,0);(π/2,π/2);(π,π) for x=0.92. We can describe the experimental data only beyond the framework of the 3-band p- d-model involving the representations of a new triplet counterpart for the Zhang-Rice singlet state.