Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors

Details Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors

2004-02-26

arxiv.org/abs/cond-mat/0402659v2

Phys. Rev. Lett 93, 267003 (2004)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures included updated version taking new data into account; factor in spectral weight corrected; Figs. 2 and 4 c

Scientific paper

10.1103/PhysRevLett.93.267003

Based on a two-dimensional model of coupled two-leg spin ladders, we derive a unified picture of recent neutron scattering data of stripe-ordered La_(15/8)Ba_(1/8)CuO_4, namely of the low-energy magnons around the superstructure satellites and of the triplon excitations at higher energies. The resonance peak at the antiferromagnetic wave vector Q_AF in the stripe-ordered phase corresponds to a saddle point in the dispersion of the magnetic excitations. Quantitative agreement with the neutron data is obtained for J= 130-160 meV and J_cyc/J = 0.2-0.25.

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