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Complementary experimental methods such as
$\mu$SR spectroscopy, ac magnetometry, and relaxation
calorimetry have been employed as a probe of critical behavior of a unique ferrimagnetic molecular magnet
${[Mn^{II}(pydz)(H_{2}O)][Mn^{II}(H_{2}O)_{2}][Nb^{IV}(CN)_{8}]\cdot 2H_{2}O}_{n}$
with $T_{c} \approx$ 42 K. A full set of critical exponents is
determined. Static exponents $\alpha$, $\beta$, $\gamma$, and the dynamic exponent $\omega$
are extracted directly from the measurements.
Further critical exponents
$\nu$, $\eta$, and
z
are derived on the basis of scaling or hyperscaling relations. The knowledge
of the thermal dependence of the order parameter combined with the results of the calorimetric measurements
allowed for the determination of two further static critical exponents
κ
and
κ'. The system shows a close affinity
to the three-dimensional (3D) Heisenberg model. Ferrimagnetism of the compound leads to a coexistence of
typically ferro- and antiferromagnetic characteristics.