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- W1505836920 abstract "The analytical expression for dynamical charge susceptibility in layered cuprates has been derived in the frame of singlet-correlated band model beyond random-phase-approximation (RPA) scheme. Our calculations performed near optimal doping regime show that there is a peak in real part of the charge susceptibility $chi({bf q},omega)$ at {bf Q} = ($pi$, $pi$) at strong enough inter-site Coulomb repulsion. Together with the strong maximum in the Im $chi({bf Q},omega)$ at 15 meV it confirms the formation of low-energetic plasmons or charge fluctuations. This provides a jsutification that these excitations are important and together with a spin flcutuations can contribute to the Cooper pairing in layered cuprates. Analysing the charge susceptibilitiy with respect to an instability we obtain a new plasmon branch, $omega_{bf q}$, along the Brillouin Zone. In particular, we have found that it goes to zero near {bf Q}$_{CDW} approx (2pi/3, 2pi/3)$." @default.
- W1505836920 created "2016-06-24" @default.
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- W1505836920 date "2001-11-13" @default.
- W1505836920 modified "2023-10-01" @default.
- W1505836920 title "Dynamical charge susceptibility in layered cuprates: Beyond the conventional random-phase-approximation scheme" @default.
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- W1505836920 doi "https://doi.org/10.1103/physrevb.64.214512" @default.
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