Ferromagnetic coupling and magnetic anisotropy in molecular Ni(II) squares

Details Ferromagnetic coupling and magnetic anisotropy in molecular Ni(II) squares Ferromagnetic coupling and magnetic anisotropy in molecular Ni(II) squares

2003-01-21

arxiv.org/abs/cond-mat/0301373v1

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.67.094407

We investigated the magnetic properties of two isostructural Ni(II) metal complexes [Ni4Lb8] and [Ni4Lc8]. In each molecule the four Ni(II) centers form almost perfect regular squares. Magnetic coupling and anisotropy of single crystals were examined by magnetization measurements and in particular by high-field torque magnetometry at low temperatures. The data were analyzed in terms of an effective spin Hamiltonian appropriate for Ni(II) centers. For both compounds, we found a weak intramolecular ferromagnetic coupling of the four Ni(II) spins and sizable single-ion anisotropies of the easy-axis type. The coupling strengths are roughly identical for both compounds, whereas the zero-field-splitting parameters are significantly different. Possible reasons for this observation are discussed.

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