Phase Diagram and Spectroscopic Signatures of a Supersolid in the Quantum Ising Magnet K2Co(SeO3)2

June 15, 2026
(Top row) Calculated and measured magnetic neutron diffraction intensity of the quasi-2D √3×√3 magnetic order. (Bottom row) Schematic diagrams and temperature regimes of the supersolid phase, UUD, and UD0 orders.

Scientific Achievement

Supersolid phases with coexisting Z₃ translational symmetry breaking and U(1) spin-rotational symmetry breaking are identified in the triangular-lattice quantum magnet K₂Co(SeO₃)₂.

Significance and Impact

This work establishes K₂Co(SeO₃)₂ as a model platform for studying supersolidity in frustrated magnets and reveal intertwined quantum orders in triangular-lattice systems.

Research Details

  • Neutron diffraction reveals quasi-2D √3×√3 magnetic order with Z₃ symmetry breaking and reduced ordered moment.
  • Inelastic neutron scattering reveals continuum excitations and coexistence of gapless and gapped modes.
  • Field-dependent measurements identify the phase diagram.

“Phase diagram and spectroscopic signatures of a supersolid in the quantum ising magnet K2Co(SeO3)2”, Nature Communication, 17, 2914 (2026).
https://www.nature.com/articles/s41467-026-69661-0