Structural phase transition in the spin gap system YbAl3C 3

Takeshi Matsumura, Toshiya Inami, Masashi Kosaka, Yoshiaki Kato, Takaki Inukai, Akira Ochiai, Hironori Nakao, Youichi Murakami, Susumu Katano, Hiroyuki S. Suzuki

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


The unresolved phase transition at 80K in YbAl3C3 has been studied by X-ray diffraction. It has been confirmed that the transition is a structural one with atomic displacement. Superlattice reflections that appear below 80 K show that the crystal structure changes from hexagonal to orthorhombic. From the reflection conditions, we conclude that the space group in the low temperature phase is Pbca, where all the atoms occupy the general 8c site. By fitting the observed intensities, we present two possible models of atomic displacement. The displacement results in the deformation of the triangular lattice of Yb spins, which is considered to be responsible for the formation of a spin-singlet ground state at low temperatures.

Original languageEnglish
Article number103601
Journaljournal of the physical society of japan
Issue number10
Publication statusPublished - 2008 Oct
Externally publishedYes


  • Dimer
  • Geometrical frustration
  • Structural phase transition
  • YbAlC

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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