  The nature of the hidden-order (HO) state in URu2Si2 remains one of the major
unsolved issues in heavy-fermion physics. Recently, torque magnetometry, x-ray
diffraction and elastoresistivity data have suggested that the HO phase
transition at THO = 17.5 K is driven by electronic nematic effects. Here, we
search for thermodynamic signatures of this purported structural instability
using anisotropic thermal-expansion, Young\'s modulus, elastoresistivity and
specific-heat measurements. In contrast to the published results, we find no
evidence of a rotational symmetry-breaking in any of our data. Interestingly,
our elastoresistivity measurements, which are in full agreement with published
results, exhibit a Curie-Weiss divergence, which we however attribute to a
volume and not to a symmetry-breaking effect. Finally, clear evidence for
thermal fluctuations is observed in our heat-capacity data, from which we
estimate the HO correlation length.

Strongly Correlated Electrons;Materials Science