Journal
JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Volume 118, Issue 6, Pages 959-970Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1063776114060223
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Funding
- Presidium of the Russian Academy of Sciences
- Russian Foundation for Basic Research [13-02-00909, 13-02-00523, 13-02-98013_r-sibir]
- Dynasty foundation
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It is shown using the 2D Emery model that the strong coupling between the spin subsystem of copper ions in the singlet state and the subsystem of oxygen holes considerably reduces the spectral intensity of the correlation function for holes on the Fermi contour. Spin-charge correlations are manifested in the existence of two channels. The first channel is due to the p-d exchange coupling of spins of the oxygen and copper holes. The second channel appears as a result of spin-correlated hoppings, when the motion of holes over oxygen ions is accompanied by spin-flip processes (i.e., simultaneous changes in the spin projections of an oxygen hole and a copper ion). It is established as a result of self-consistent calculations that the allowance for the concentration dependence of spin correlators and multicenter spin-charge correlators appearing in the dispersion equation ensures a decrease in the energy of the system and considerably affects the evolution of the Fermi surface under hole doping.
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