Research

Figure 1

M-H curves measured in the pulsed magnetic fields (black solid curve): (a) {Mo72V30} at 0.5 K, (b) {W72V30} at 1.4 K. Red dashed curves show results of fitting by the sum of the linear term and Brillouin function for S=1/2. Gray solid curves show the linear (intrinsic) parts of the magnetization. Blue dashed lines show results of the theoretical calculations performed by Kunisada et al. [23] (c) M-Hcurve calculated using the Heisenberg model considering the DM interaction and the Zeeman effect. In the calculation, that corresponds to {W72V30}, the DM vector point radially outwards. The DM interaction strength is J/5 of the Heisenberg interaction J. The temperature was chosen as T=1.15K. Because of the complete lack of symmetry, very time consuming calculations were performed using the finite-temperature Lanczos method [37]. (From Evidence of low-energy singlet excited states in the spin-12polyhedral clusters {Mo72V30} and {W72V30} with strongly frustrated kagome networks)