Phys. Rev. Lett. 93, 267003 (2004) [4 pages]Unifying Magnons and Triplons in Stripe-Ordered Cuprate SuperconductorsReceived 26 February 2004; published 20 December 2004 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 La15/8Ba1/8CuO4, 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 QAF 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 Jcyc/J=0.2–0.25. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.267003
DOI:
10.1103/PhysRevLett.93.267003
PACS:
74.25.Ha, 75.10.Jm, 75.40.Gb, 75.50.Ee
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