Observation of field-dependent magnetic parameters in the magnetic molecule {Ni4Mo12}

Abstract

We investigate the bulk magnetic, electron paramagnetic resonance, and magneto-optical properties of {Ni4Mo12}, a magnetic molecule with antiferromagnetically coupled tetrahedral {Ni4Mo12} in a diamagnetic molybdenum matrix. The low-temperature magnetization exhibits steps at irregular field intervals, a result that cannot be explained using a Heisenberg model even if it is augmented by magnetic anisotropy and biquadratic terms. Allowing the exchange and anisotropy parameters to depend on the magnetic field provides the best fit to our data, suggesting that the molecular structure (and thus the interactions between spins) may be changing with applied magnetic field.

10 pages, 12 figures, submitted to Phys. Rev. B. More information at http://www.physik.uni-osnabrueck.de/makrosysteme/

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Cited by in corpus (15)

• Magnetic Cluster Excitations
• Tetrahedra system Cudaca: high-temperature manifold of molecular configurations governing low-temperature properties
• Single-ion and exchange anisotropy effects and multiferroic behavior in high-symmetry tetramer single molecule magnets
• Theory of high-symmetry tetramer single molecule magnets
• Sampling the two-dimensional density of states g(E,M) of a giant magnetic molecule using the Wang-Landau method
• Spin anisotropy effects in dimer single molecule magnets
• Thermodynamic observables of Mn12-acetate calculated for the full spin-Hamiltonian
• Inelastic neutron scattering study and Hubbard model description of the antiferromagnetic tetrahedral molecule Ni4Mo12
• Magnetic and neutron spectroscopic properties of the tetrameric nickel compound $[M{o}_{12}{O}_{28}({\mu }_2-OH{)}_9({\mu }_3-OH{)}_3{Ni(H_{2}O{)}_3}_4]$\cdot$13H_{2}O$
• Magnetization steps in the molecular magnet Ni${}_4$Mo${}_{12}$ revealed by complex exchange bridges
• Insights into nature of magnetization plateaus of a nickel complex [Ni4(CO3)2(aetpy)8](ClO4)4 from a spin-1 Heisenberg diamond cluster
• Magnetocaloric effect in integrable spin-s chains
• Determination of spin Hamiltonian in the Ni${}_4$ magnetic molecule
• Molecular magnetism in the multi-configurational self-consistent field method
• A systematic approach to determine the spectral characteristics of molecular magnets