We have performed the thermal expansion α(T) and elastic constant c(T) measurements of the heavy electron system URu2Si2, with special attention to the tetragonal symmetry of Γ3 (x2 - y2) and Γ4(xy). The experimental results of c66, 1/2(c11 - c12) and α(T) along [±110] do not confirm a sizable uniform distortion for these two types of symmetry through a puzzling phase transition at To = 17.5 K. On the other hand, the 1/2(c11 - c12) data, which are missing in the previous detailed study, are found to show a weak but significant tendency of softening below about 70 K, suggesting an elastic response of the quadrupolar moment of J2x - J2y.
- Elastic constants
- Quadrupolar instability
- Thermal expansion
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering