The magnetic dynamic structure factor of the one-dimensional S = 1/2 chain system BaCu2(Si0.5Ge0.5)2O7 is studied in a wide range of energy transfers and temperatures. Contrary to previous erroneous reports [T. Masuda et al., Phys. Rev. Lett. 93, 077206 (2004)], the scaling properties observed in the range 0.5-25 meV are found to be fully consistent with expectations for a Luttinger spin liquid. At higher energies, a breakdown of scaling laws is observed and attributed to lattice effects. The results are complementary to those found in literature for other S = 1/2-chain compounds, such as KCuF3 and Cu-benzoate.
@article{arxiv.cond-mat/0611030,
title = {Scaling of dynamic spin correlations in BaCu2SiGeO7},
author = {A. Zheludev and T. Masuda and G. Dhalenne and A. Revcolevschi and C. Frost and T. Perring},
journal= {arXiv preprint arXiv:cond-mat/0611030},
year = {2015}
}