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Temperature (left) and frequency (right) dependences of the real (χ’, top) and imaginary (χ”, bottom) parts of the ac susceptibility, between 1.8 and 15 K and between 10 and 10000 Hz respectively, for 2 in a 0.45-T dc field. Solid lines are visual guides on the left part of the figure and are the best fit of the experimental data to the generalized Debye model.
