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Critical behavior of quasi-two-dimensional semiconducting ferromagnet CrGeTe
The critical properties of the single-crystalline semiconducting ferromagnet
CrGeTe were investigated by bulk dc magnetization around the paramagnetic
to ferromagnetic phase transition. Critical exponents
with critical temperature K and
with K are obtained by the Kouvel-Fisher method whereas
is obtained by the critical isotherm analysis at K. These critical exponents obey the Widom scaling relation , indicating self-consistency of the obtained values. With these
critical exponents the isotherm curves below and above the critical
temperatures collapse into two independent universal branches, obeying the
single scaling equation , where and are renormalized
magnetization and field, respectively. The determined exponents match well with
those calculated from the results of renormalization group approach for a
two-dimensional Ising system coupled with long-range interaction between spins
decaying as with
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