Evidence for a nematic component to the Hidden Order parameter in URu2Si2 from differential elastoresistance measurements
Scott C. Riggs, M. C. Shapiro, Akash V. Maharaj, S. Raghu, E. D., Bauer, R. E. Baumbach, P. Giraldo-Gallo, Mark Wartenbe, I. R. Fisher
TL;DR
This study uses differential elastoresistance measurements to demonstrate that the Hidden Order phase in URu2Si2 has a nematic component, with nematic susceptibility changing sign near the transition, indicating complex symmetry breaking.
Contribution
It provides direct experimental evidence of nematic fluctuations in URu2Si2's Hidden Order phase, revealing additional symmetry breaking beyond previous understanding.
Findings
Nematic component detected in Hidden Order phase
Nematic susceptibility changes sign at transition
Hidden Order breaks additional symmetries
Abstract
Measurements of the differential elastoresistance of URuSi 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.
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