Unifying Magnons and Triplons in Stripe-Ordered Cuprate Superconductors
G.S. Uhrig, K.P. Schmidt, and M. Gr\"uninger
TL;DR
This paper presents a unified theoretical model that explains both low-energy magnons and high-energy triplon excitations observed in neutron scattering experiments on stripe-ordered cuprate superconductors, specifically La_15/8Ba_1/8CuO_4.
Contribution
It introduces a coupled two-leg spin ladder model that unifies the description of magnetic excitations across different energy scales in stripe-ordered cuprates.
Findings
Quantitative agreement with neutron scattering data for specific exchange parameters.
Identification of the resonance peak as a saddle point in the magnetic excitation dispersion.
Unified description of magnons and triplons in stripe-ordered phases.
Abstract
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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