Lattice Instability and Elastic Response in the Heavy Electron System URu2Si2

Keitaro Kuwahara, Hiroshi Amitsuka, Toshiro Sakakibara, Osamu Suzuki, Shintaro Nakamura, Terutaka Goto, Marián Mihalik, Alois A. Menovsky, Anne De Visser, Jaap J.M. Franse

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40 Citations (Scopus)


We have performed thermal expansion and elastic constant measurements of the heavy electron system URu2Si2, focusing attention on the Γ3(x2 - y2) and Γ4 (xy) symmetry of the tetragonal group D4h. It is reconfirmed that there is no sizable uniform spontaneous distortion for these two types of symmetry through the puzzling phase transition at T0 = 17.5 K. On the other hand a weak but significant tendency of softening are found below about 70 K in the transverse (c11 - c12) /2 mode. The results strongly suggest the presence of a lattice instability in the Γ3 symmetry From the results, proposed crystalline-electric-field models are also discussed.

Original languageEnglish
Pages (from-to)3251-3258
Number of pages8
JournalJournal of the Physical Society of Japan
Issue number10
Publication statusPublished - 1997 Oct


  • Elastic constant
  • Heavy electron
  • Lattice instability
  • Thermal expansion
  • URuSi


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