Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors
classification
❄️ cond-mat.supr-con
cond-mat.str-el
keywords
stripe-ordereddataexcitationsmagnonsneutronagreementantiferromagneticaround
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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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