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Out-of-phase ac-susceptibility ¡ä¡ä vs frequency ¦Í on a logarithmic
scale for 1 over the temperature range 1.9-25 K.

Figure 3. Dynamical susceptibility (¦Ø)at7and8Kfor 1, displayed as          
a Cole-Cole diagram. Solid lines indicate fits to eq 1.          

The two maxima
observed in the out-of-phase ac signals are indicative of the operation
of more than one relaxation process in this compound, which are likely
to be affected by the nature or directions of the easy axes through the
ligand fields.

Two separate relaxation processes are clearly observed
at 7 and 8 K (Figure 3) that can be nicely described by the sum of
two modified Debye functions

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