Magnetic Excitations in Bilayer High-Temperature Superconductors with Stripe Correlations

Details Magnetic Excitations in Bilayer High-Temperature Superconductors with Stripe Correlations Magnetic Excitations in Bilayer High-Temperature Superconductors with Stripe Correlations

2005-02-18

arxiv.org/abs/cond-mat/0502460v2

JPSJ, Vol. 74 (2005) Supplement page 86

Physics

Condensed Matter

Superconductivity

2x12 pages, 2x12 figures (color and bw version)

Scientific paper

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.

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