Fig. 1: Schematics of spin exchange interaction, spin-exciton coupling and the phase diagram of Cu3Co2SbO6. | Nature Communications

Fig. 1: Schematics of spin exchange interaction, spin-exciton coupling and the phase diagram of Cu3Co2SbO6.

From: Optical detection of bond-dependent and frustrated spin in the two-dimensional cobalt-based honeycomb antiferromagnet Cu3Co2SbO6

Fig. 1: Schematics of spin exchange interaction, spin-exciton coupling and the phase diagram of Cu3Co2SbO6.The alternative text for this image may have been generated using AI.

a Layered crystal structures of Cu3Co2SbO6 with alternative Cu+ and (Co2/3Sb1/3)O2- layers. (Left), The possible dominant magnetic spin exchange interaction of (Co2/3Sb1/3)O2- layers has two-dimensional honeycomb structures. The blue circles indicate the cobalt atom. The blue, red, and green solid lines are anisotropic Kitaev spin exchange interactions along each direction. The black and sky arrows show the nearest and third-nearest neighbor isotropic Heisenberg spin exchange interaction, respectively. (Right), The schematic of exciton formation of Cu3Co2SbO6. Within incident light, there is formation of excitons between Cu+ and (Co2/3Sb1/3)O2- layers, which interact with the spin exchange interaction shown in left panel. b Suggested magnetic phase diagram of Cu3Co2SbO6 with H along the bond-parallel direction (PM: paramagnetic region, AFM antiferromagnetic region, SP spin-polarized region). The TN and TH is obtained from the χ(T) measurement and optical spectroscopy, respectively. Unconventional spin fluctuating regime was observed between low-T AFM and high-T PM phases.

Back to article page