Long-lived magnons throughout the Brillouin zone of the strong-leg spin ladder (C$_7$H$_{10}$N)$_2$CuBr$_4$

TL;DR

This study uses inelastic neutron scattering to observe sharp magnons across the entire Brillouin zone in a strong-leg spin ladder compound, confirming the symmetric spin ladder model and accurately estimating exchange interactions.

Contribution

The paper provides the first comprehensive observation of long-lived magnons throughout the Brillouin zone in a strong-leg spin ladder, validating the symmetric model and refining exchange interaction estimates.

Findings

Magnons are observed across the entire Brillouin zone.

Results confirm the symmetric spin ladder model.

Exchange interactions are reliably estimated.

Abstract

Inelastic neutron scattering is used to measure spin excitations in fully deuterated single crystal samples of the strong-leg antiferromagnetic S=1/2 spin ladder compound (C$_7$H$_{10}$N)$_2$CuBr$_4$. Sharp resolution-limited magnons are observed across the entire one-dimensional Brillouin zone. The results validate the previously proposed {\it symmetric} spin ladder model and provide a reliable estimate of the relevant exchange interactions.