Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 25: Correlated Electrons - Poster Session

TT 25.30: Poster

Mittwoch, 29. März 2006, 14:30–18:30, P1

Doping dependence of spin excitations in the stripe phase of high-Tc superconductors — •Götz Seibold¹ and Jose Lorenzana² — ¹Institut für Physik, BTU Cottbus, PBox 101344, 03013 Cottbus, Germany — ²SMC-INFM,ISC-CNR, Dipartimento di Fisica, Universita di Roma La Sapienza, P. Aldo Moro 2, 00185 Roma, Italy

Based on the time-dependent Gutzwiller approximation of the extended Hubbard model we calculate the energy and momentum dependence of spin excitations for striped ground states. Since our approach correctly reproduces the experimentally obtained incommensurability vs. doping behavior in La-based cuprates the present investigation allows to quantitatively predict the energy ω_res and intensity of the ’resonance peak’ as well as the spin velocity of high energy (optical) magnons in this compound. In the underdoped regime δ < 1/8 we find a linear dependence ofω_res on doping whereas the resonance energy significantly shifts to higher values when the charge concentration in the stripes starts to deviate from half filling for δ > 1/8.