We present a combined x-ray and neutron diffraction study of the stripe ordered superconductor \lscox{0.12}. The average crystal structure is consistent with the orthorhombic Bmab space group as commonly reported in the literature. This structure however is not symmetry compatible with a second order phase transition into the stripe order phase, and, as we report here numerous Bragg peaks forbidden in the Bmab space group are observed. We have studied and analysed these Bmab-forbidden Bragg reflections. Fitting of the diffraction intensities yields monoclinic lattice distortions that are symmetry consistent with charge stripe order.
@article{arxiv.2201.04858,
title = {Crystal Symmetry of Stripe Ordered La1.88Sr0.12CuO4},
author = {Ruggero Frison and Julia Kuespert and Qisi Wang and Oleh Ivashko and Martin von Zimmermann and Martin Meven and Damian Bucher and Jakob Larsen and Christof Niedermayer and Marc Janoschek and Tohru Kurosawa and Naoki Momono and Migaku Oda and Niels Bech Christensen and Johan Chang},
journal= {arXiv preprint arXiv:2201.04858},
year = {2022}
}