Skip to main content
MANA Digest 2025

Quantum Magnetic Materials Team

Quantum Materials Field

Exploring materials with novel electronic and magnetic properties and functionalities

Group Leader:Tomohiro Takayama

  1. MANA Digest TOP
  2. Year of 2025
  3. Quantum Materials Field
  4. Quantum Magnetic Materials Team

Development of novel quantum magnetic materials

Current Topics

Quantum spin liquids (QSL) represent a novel quantum state of matter, whose excitations may be potentially exploited as a component of quantum computation. Among several models of QSL, the Kitaev honeycomb model stands out since its ground state is rigorously shown to be a QSL [ 1 ].

We have been exploring candidate materials for a Kitaev QSL [ 2 ]. Recently, we found that the honeycomb-based cobalt oxide, γ-Co2P2O7, displays a spin-liquid-like behavior under magnetic fields. Its potential relevance to a Kitaev-type QSL is currently under investigation.

Fig. (Left) Schematic figure of the Kitaev honeycomb model. Different components of spin-1/2 couple ferromagnetically on each bond of a honeycomb lattice. (Right) Buckled honeycomb lattice of Co atoms in γ-Co2P2O7.

References

  1. A. Kitaev,Annals of Physics321, 2 (2006). DOI: 10.1016/j.aop.2005.10.005
  2. H. Takagi, T. Takayama, G. Jackeli, G. Khaliullin, S. E. Nagler,Nature Reviews Physics1, 264 (2019). DOI: 10.1038/s42254-019-0038-2

Group members

  • Tomohiro Takayama

    Tomohiro Takayama

    • Team Leader
  • Hidenori Takagi

    Hidenori Takagi

    • NIMS Invited Researcher

Activities

Links