Physics – Condensed Matter – Superconductivity
Scientific paper
2004-11-16
JETP Letters 80(11), 819 (2004) and Virt. J. of Appl. of Supercond. 8(4) Feb. 15 (2005)
Physics
Condensed Matter
Superconductivity
16 pages, 4 figures
Scientific paper
10.1134/1.1862796
The experimental dispersion of the first removal state in the insulating regime of Bi2Sr2Ca1-xYxCu2O8+delta is found to differ significantly from that of other parent materials: oxyclorides and La2CuO4 . For Y-contents of 0.92 > x > 0.55 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);(pi/2, pi/2);(pi,pi) for x=0.92. We can describe the experimental data only beyond the framework of the 3-band pd-model involving the representations of a new triplet counterpart for the Zhang-Rice singlet state.
Gavrichkov V. A.
Janowitz Christoph
Krapf Alica
Manzke Recardo
Ovchinnikov Sergei G.
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