Measurements of the differential elastoresistance of URu2Si2 reveal that the fluctuations associated with the 17 K Hidden Order phase transition have a nematic component. Approaching the "Hidden Order" phase transition from above, the nematic susceptibility abruptly changes sign, indicating that while the Hidden Order phase has a nematic component, it breaks additional symmetries.
@article{arxiv.1405.7403,
title = {Evidence for a nematic component to the Hidden Order parameter in URu2Si2 from differential elastoresistance measurements},
author = {Scott C. Riggs and M. C. Shapiro and Akash V. Maharaj and S. Raghu and E. D. Bauer and R. E. Baumbach and P. Giraldo-Gallo and Mark Wartenbe and I. R. Fisher},
journal= {arXiv preprint arXiv:1405.7403},
year = {2015}
}