Evidence for a nematic component to the Hidden Order parameter in   URu2Si2 from differential elastoresistance measurements
  Measurements of the differential elastoresistance of URu$_2$Si$_2$ 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. 
Scott C. Riggs, M. C. Shapiro, Akash V. Maharaj, S. Raghu, E. D.   Bauer, R. E. Baumbach, P. Giraldo-Gallo, Mark Wartenbe, I...
cond-mat.str-el