Quantum magnetism of perfect spin tetrahedra in Co4 B6 O13

Hiroyuki Hagiwara, Hirohiko Sato, Masahiro Iwaki, Yasuo Narumi, Koichi Kindo

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Co4 B6 O13 contains undistorted tetrahedral clusters of magnetic Co2+ ions. The high-field magnetization of this magnet exhibits a periodic undulation indicating quantization of the total spin number per cluster. Measurements of magnetic susceptibility and specific heat reveal that the ground state is composed of several different singlet states, reflecting the high symmetry of the spin tetrahedron. An exact diagonalization calculation taking account of single-ion-type anisotropies and Dzyaloshinsky-Moriya interactions reproduces the experimental results very well.

Original languageEnglish
Article number014424
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number1
Publication statusPublished - 2009 Aug 6
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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