Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 30: Superconductivity: Twenty Years High-Tc Cuprates - Recent Progress
TT 30.2: Vortrag
Donnerstag, 30. März 2006, 14:15–14:30, HSZ 02
Origin of dynamic stripe correlations in the charge response of cuprates — •Peter Horsch and Giniyat Khaliullin — Max-Planck-Institut FKF, 70569 Stuttgart, Germany
We discuss the dynamical density fluctuation spectra of cuprates starting from the t−J model in the slave-boson 1/N framework [1]. Our theory provides the generic density response of a doped Mott-insulator and reveals novel low-energy structure on the energy scale J+δ t due to the correlated motion of holes in a RVB spin liquid. This low-energy response implies an anomalous renormalization of several phonon modes [2,3]. In particular our approach explains the peculiar doping dependence of breathing and bond-stretching phonons as observed by neutron scattering [4]. Here we further extend the discussion and analyse the connection between incommensurabilities in the spin-response and dynamic stripe correlations in the charge response of cuprates. Finally we address the question why collinear charge stripes are favored in LSCO compounds.
[1] G. Khaliullin and P. Horsch, Phys. Rev. B 54, R9600 (1996).
[2] G. Khaliullin and P. Horsch, Physica C 282-287, 1751 (1997).
[3] P. Horsch and G. Khaliullin, Physica B 359-361, 620 (2005).
[4] L. Pintschovius, phys. stat. sol. (b) 242, 30 (2005).