Magnetic properties of quasi-2D antiferromagnet {N(n-C5H11)4[MnIIFeIII(ox)3]}∞ below Neel temperature:: revisited

Magnetic measurements of {N(n-C5H11)(4)[(MnFeIII)-Fe-II(ox)(3)]}(infinity) were carried out in the 5-300 K temperature range under different applied magnetic fields up to 50 kOe with zero-field-cooled (ZFC) and field-cooled (FC) modes. The FC and ZFC chi(T) plots exhibited a significantly large bifurcation below the transition temperature, which was traceable even at 50 kOe of applied magnetic field. The bifurcation temperature was found to be magnetic field dependent for the lower range of magnetic fields, which can be represented by a polynomial of magnetic field. The observed magnetic transition temperature of this compound was in good agreement with the earlier reported results. The isothermal magnetization curves below the magnetic transition temperature were found to deviate significantly from linearity above 30 kOe and above this field value became increasingly sigmoidal with decreasing temperature. This behavior might be associated with a magnetic field-induced transition in this compound. (C) 2003 Elsevier B.V. All rights reserved.