Evidence for site-centered stripes from magnetic excitations in CuO superconductors

Abstract

The success of models of coupled two-leg spin ladders in describing the magnetic excitation spectrum of La_[2-x]Ba_xCuO_4 has been widely interpreted as evidence for bond-centered stripes. Here, we determine the magnetic coupling induced by the charge stripes between bond- or site-centered spin stripes modeled by two- or three-leg ladders, respectively. We find that only the site-centered models order. We further report excellent agreement of a fully consistent analysis of coupled three-leg ladders using a spin wave theory of bond operators with the experiment.

5 pages, 4 figures

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• Disorder Induced Stripes in d-Wave Superconductors
• Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly-doped La1.96Sr0.04CuO4
• Jahn-Teller mechanism of stripe formation in doped layered La${}_{2-x}$Sr${}_x$NiO${}_4$ nickelates
• Magnetic Excitations in the Site-Centered Stripe Phase: Spin Wave Theory of Coupled Three-Leg Ladders