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TT: Tiefe Temperaturen

TT 30: Superconductivity: Twenty Years High-T_c Cuprates - Recent Progress

TT 30.6: Vortrag

Donnerstag, 30. März 2006, 15:15–15:30, HSZ 02

Spin excitations in fluctuating stripe phases — •Matthias Vojta¹, Thomas Vojta², and Ribhu Kaul^1,3 — ¹Universität Karlsruhe, Germany — ²University of Missouri, Rolla, USA — ³Duke University, Durham, USA

Using a phenomenological lattice model of coupled spin and charge modes, we determine the spin susceptibility in the presence of fluctuating stripe charge order. We assume the charge fluctuations to be slow compared to those of the spins, and combine Monte Carlo simulations for the charge order parameter with exact diagonalization of the spin sector. Our calculations unify the spin dynamics of both static and fluctuating stripe phases and support the notion of a universal spin excitation spectrum in doped cuprate superconductors.