Thermal expansion and ultrasonic measurements of ferroquadrupole ordering in HoB6

Takashi Yamaguchi, Mitsuhiro Akatsu, Yoshiyuki Nakano, Takehito Washizawa, Yuichi Nemoto, Terutaka Goto, Andreas Dönni, Shintaro Nakamura, Satoru Kunii

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Rare-earth hexaboride HoB6 shows a ferroquadrupole ordering of Oyz, Ozx and Oxy with ΓQ symmetry at TQ = 6.1 K accompanied by a structural change from cubic to trigonal. In order to examine the order parameter in HoB6, we have performed ultrasonic and thermal expansion measurements. The lattice length along [001] expands ΔL/L[001] = 2.5 × 10-4 just below TQ, while the length along [111] shrinks appreciably ΔL/L[111] = -4.5 × 10-3. This result confirms the cubic-trigonal distortion observed by neutron scattering experiments.

Original languageEnglish
Pages (from-to)622-623
Number of pages2
JournalPhysica B: Condensed Matter
Issue numberII
Publication statusPublished - 2003 May


  • Fcrroquadrupole ordering
  • HoB
  • Thermal expansion
  • Ultrasound


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