Crystal structure of showing the Fe(1) and Fe(2) dimer network. The Fe(2) dimers are located near the corners of the unit cell, and the Fe(1) dimers near .
Temperature dependence of the inverse dc susceptibility, defined as , for at and in comparison with that of . Solid lines show the Curie-Weiss fit at high temperatures .
Field dependence of the dc magnetization for at . The corresponding isothermal curve for is included for comparison.
Low temperature dependence of the ZFC and FC magnetizations for at different magnetic fields.
Temperature dependence of the EPR spectra for at the band . Dashed lines show the best-fit curves to a single Lorentzian line shape.
Temperature dependence of the factor (left axis) and the resonance linewidth (half-width at half-height) (right axis) for . The dashed line shows calculated as a function of temperature. The inset shows the temperature variation of .
Temperature dependence of the resonant intensity (left axis) and of the product (right axis) for . Solid and dashed lines show the corresponding best-fit curves to the pair model.
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