Reply to: Comment by S.-L. Drechsler et al. (arXiv:1006.5070v2)

TL;DR

This paper refutes a recent comment claiming a different magnetic interaction strength in LiCuVO4, demonstrating that their parameters conflict with experimental data and supporting the original model with a four-spinon continuum.

Contribution

The authors clarify the magnetic interaction parameters in LiCuVO4, confirming the existence of a four-spinon continuum and defending their previous findings against recent criticism.

Findings

Drechsler et al.'s parameters conflict with susceptibility data

Magnetization curve cannot distinguish between parameter sets

Support for the four-spinon continuum in LiCuVO4

Abstract

In a comment on arXiv:1006.5070v2, Drechsler et al. claim that the frustrated ferromagnetic spin-1/2 chain LiCuVO4 should be described by a strong rather than weak ferromagnetic nearest-neighbor interaction, in contradiction with their previous work. Their comment is based on DMRG and ED calculations of the magnetization curve and the magnetic excitations. We show that their parameters are at odds with the magnetic susceptibility and the magnetic excitation spectrum, once intensities are taken into account, and that the magnetization curve cannot discriminate between largely different parameter sets within experimental uncertainties. We further show that their new exact diagonalization results support the validity of the RPA-approach, and strongly reinforce our conclusion on the existence of a four-spinon continuum in LiCuVO4, see Enderle et al., Phys. Rev. Lett. 104 (2010) 237207.