Fig. 1: Structure, Brillouin zone, magnetic Bragg peak, d.c. susceptibility and specific heat of Ni2Mo3O8.
From: Diffusive excitonic bands from frustrated triangular sublattice in a singlet-ground-state system
a A schematic of the structure of Ni2Mo3O8 with a-, b-, c-axis labeled. b The octahedral coordinated Ni ions (blue) and the tetrahedral coordinated Ni ions (green) form a quasi-2D honeycomb lattice. c, d Side (along the b-axis) and top (along the c-axis) view of the magnetic structure of Ni2Mo3O8. The black frames indicate the size of magnetic unit cell and black arrows denote magnetic exchange couplings along different directions. e Temperature dependence of the intensities in arbitrary units (a. u.) of two magnetic Bragg peaks at (3/2,0,1) and (1/2,−1/2,0). Inset shows a 2D color plot in the [H, 0, L] plane, in which magnetic Bragg peaks are indicated by red arrows. The vertical error bars are statistical errors of 1 standard deviation. f The d.c. susceptibility with 1–8 T magnetic fields perpendicular to the c-axis. Data are shifted by magnetic field × 0.01 emu / mol T for clarity. Magnetic transition is suppressed in the 8 T field. g The magnetic contribution to the specific heat Cmag with 0-8 T magnetic fields perpendicular to the c-axis. Magnetic transition is suppressed in the 8 T field. h Temperature versus magnetic field phase diagram from d.c. susceptibility and specific data.
