A nematic order in stripe-ordered cuprates was recently identified with (001) reflection at resonant energies associated with the in-plane states. However, whether this resonant reflection is ubiquitous among all 214 cuprates is still unknown. Here we report a Resonant soft X-ray Scattering (RXS) measurement on two La2−xSrxCuO4+y crystals. Charge order was found in La2CuO4+y with a total hole concentration near 0.125/Cu but no measurable (001) peak at any resonance, while in a La1.94Sr0.06CuO4+y sample near 0.16/Cu a (001) peak resonant was identified to be consistent with the presence of LTT tilting. The lack of such a (001) peak in a compound with stripe-like charge order raises questions about nematicity and the origin of the scattering feature.
@article{arxiv.1707.04367,
title = {On Nematicity and Charge Order in Superoxygenated La$_{2-x}$Sr$_x$CuO$_{4+y}$},
author = {Zhiwei Zhang and R. Sutarto and F. He and F. C. Chou and L. Udby and S. L. Holm and Z. H. Zhu and W. A. Hines and J. I. Budnick and B. O. Wells},
journal= {arXiv preprint arXiv:1707.04367},
year = {2018}
}