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 and I.R. Fisher
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Scott C. Riggs: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
M.C. Shapiro: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
Akash V Maharaj: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
S. Raghu: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
E.D. Bauer: Los Alamos National Laboratory
R.E. Baumbach: Los Alamos National Laboratory
P. Giraldo-Gallo: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
Mark Wartenbe: National High Magnetic Field Laboratory, Florida State University
I.R. Fisher: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract For materials that harbour a continuous phase transition, the susceptibility of the material to various fields can be used to understand the nature of the fluctuating order and hence the nature of the ordered state. Here we use anisotropic biaxial strain to probe the nematic susceptibility of URu2Si2, a heavy fermion material for which the nature of the low temperature ‘hidden order’ state has defied comprehensive understanding for over 30 years. Our measurements reveal that the fluctuating order has a nematic component, confirming reports of twofold anisotropy in the broken symmetry state and strongly constraining theoretical models of the hidden-order phase.

Date: 2015
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DOI: 10.1038/ncomms7425

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