Low-temperature behavior of the elastic constant C44 in CexLa1-xB6

Yuichi Nemoto, Mitsuhiro Akatsu, Terutaka Goto, Osamu Suzuki, Shintaro Nakamura, Satoru Kunii

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)


We have made the ultrasonic experiments to examine the low-temperature elastic properties in the Kondo compound CexLa1-xB6 for x = 0.70, 0.65 and 0.60. The transverse C44 mode in x = 0.70 and 0.65 shows steep decrease as much as 25% around the transition point into the ordered phase IV. The remarkable softening of C44 down to 25 mK reveals that the phase IV remains to be stable even at absolute zero in x = 0.70 and 0.65. The C44 of x = 0.60 shows gentle decrease about 9% below 1 K with a minimum around 0.4 K suggesting the absence of phase IV. A considerable discrepancy between the low-temperature limit of C44 in x = 0.60, 0.50 and that in x = 0.70, 0.65 indicates that the ground state of x = 0.60 and 0.50 is the nonmagnetic state attributed to the Kondo screening effect.

Original languageEnglish
Pages (from-to)191-193
Number of pages3
JournalPhysica B: Condensed Matter
Publication statusPublished - 2002 Mar
EventInternational Conference on Strongly Correlated Electrons - Ann Arbor, MI, United States
Duration: 2002 Aug 62002 Aug 6


  • Antiferroquadrupolar ordering
  • CeLaB
  • Kondo effect


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