Studies of a Nickel-Based Single-Molecule Magnet

Single-ion anisotropy effects on the energy spectra of spin S=1 Heisenberg ring

“…What is more important, the anisotropy-dependent results support also the conclusions about the non-uniform interactions in Ni 12 . As discussed previously [22], the estimate of the energy barrier found in [7] leads to the value D ≈ −0.2.…”

“…Our data for D = 0 confirm the results of Ref. [7] for the uniform model. What is more important, the anisotropy-dependent results support also the conclusions about the non-uniform interactions in Ni 12 .…”

“…The results for the field-dependent level splitting are restricted to the antiferromagnetic coupling J/k B = −8.5 K, assuming g = 2.13 (the values found for the Ni 12 cluster [7,18]). For the positive ratio D/|J| = 0.1 the energy is plotted in Fig.…”

“…One of the interesting systems is the high nuclearity ring described by the formula Ni 12 (O 2 CMe) 12 (chp) 12 (H 2 O) 6 (THF) 6 (referred to as the supramolecular cluster Ni 12 ) which displays the single molecule magnet (SMM) properties [7]. The compound has two nickel atoms in the asymmetric unit, bound to six oxygen atoms in the distorted octahedral array.…”

“…The nickel ions are bridged by intersecting Ni 2 O 2 rings and there are no significant intermolecular interactions. Its neutron scattering spectra have been interpreted in terms of the S=1 non-uniform isotropic Heisenberg model [7]. However, the anisotropy effects have not been taken into account.…”