2005/02/21 by G. S. Uhrig, K. P. Schmidt, M. Grüninger
Physics and Astronomy · #cond-mat.supr-con #cond-mat.str-el
published as JPSJ, Vol. 74 (2005) Supplement page 86 · 2x12 pages, 2x12 figures (color and bw version)
arxiv created 2005/02/21 · arxiv updated 2009/12/01
The universal behaviour of the magnetic excitations in high-temperature superconductors is described in a model with static stripes retaining only the localized spin degrees of freedom. The stripes are represented by a model of coupled two-leg spin ladders. We start from the results obtained previously by continuous unitary transformations for an isolated spin ladder. A quantitative description of neutron scattering data is reached, using a model for a single cuprate layer with well established values of the exchange coupling constants. The neutron resonance peak is explained in terms of a saddle point in the dispersion of the magnetic excitations. Here we make predictions for bilayer systems with in-phase or out-of-phase stripe correlations. The results may serve as a guide for future experimental analyses.