Doping dependence of the resonance peak and incommensuration in high-$T_{c}$ superconductors

Details Doping dependence of the resonance peak and incommensuration in high-$T_{c}$ superconductors Doping dependence of the resonance peak and incommensuration in high-$T_{c}$ superconductors

2001-03-22

arxiv.org/abs/cond-mat/0103456v1

frafc Phys. Rev. B 66, (2002) 014506

Physics

Condensed Matter

Superconductivity

5 pages, 4 PS figures

Scientific paper

10.1103/PhysRevB.66.014506

The doping and frequency evolutions of the incommensurate spin response and the resonance mode are studied based on the scenario of the Fermi surface topology. We use the slave-boson mean-field approach to the $t-t^{\prime}-J$ model and including the antiferromagnetic fluctuation correction in the random-phase approximation. We find that the equality between the incommensurability and the hole concentration is reproduced at low frequencies in the underdoped regime. This equality observed in experiments was explained {\it only} based on the stripe model before. We also obtain the downward dispersion for the spin response and predict its doping dependence for further experimental testing, as well as a proportionality between the low-energy incommensurability and the resonance energy. Our results suggest a common origin for the incommensuration and the resonance peak based on the Fermi surface topology and the d-wave symmetry.

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