Abstract
The temperature dependence of the ac susceptibility ( χ) at constant applied magnetic field was investigated in the paramagnetic region of the quasi-2D ferromagnet (CH 3NH 3) 2CuCl 4. Above the Curie temperature ( T C=8.85 K) a maximum in the χ( T, H) curves was observed at T m( H). The temperature at the maximum increases with increasing applied field. This anomaly is related to short range fluctuations close the order transition. The behavior of T m( H) is governed by the gap exponent of the scaling function ( Δ= γ+ β). We found Δ=2.2±0.1 in very good agreement with the previously known values of γ and β.
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