Lattice distortion and spontaneous Γ5g ferro-quadrupole moment in phase IV of CexLa1-xB6

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

Research output: Contribution to journalArticlepeer-review


We have performed low-temperature thermal expansion measurements to investigate lattice effect of the phase IV in CexLa1- xB6, for x=0.75 and 0.70. In phase IV of both compounds, lattice length along the [1 1 1] direction shrinks notably, on the other hand length along the [0 0 1] direction expands. These results provide evidence that the spontaneous Γ5g ferro-quadrupole moment 〈Oyz〉=〈Ozx〉=〈Oxy〉≠0 is relevant in phase IV because the trigonal lattice distortion is described by the symmetry strain 〈εyz〉=〈εzx〉=〈εxy〉≠0 simultaneously.

Original languageEnglish
Pages (from-to)956-958
Number of pages3
JournalPhysica B: Condensed Matter
Issue numberSPEC. ISS.
Publication statusPublished - 2005 Apr 30


  • Hermal expansion
  • Multipole effect
  • Quadrupole ordering
  • Ultrasound

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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