Abstract
Temperature dependence of the magnetization M(T) is calculated for [NH2 NH3][M(HCOO)3] (M=Fe, Mn), namely, HyFe (perovskite and chiral) below =12.5 K and, for HyMn (chiral) below and above =7.9 K (at 100 Oe) by the molecular field theory (MFT). Close to the magnetic transition temperature (), the temperature (at 100 Oe) and the field (at 2K) dependence of the magnetization M(T, H) is analyzed by the power–law formula using the literature data. Magnetic susceptibility is predicted as a function of the field (T = 2K). Also, the temperature dependence of the heat capacity is calculated by the compressible Ising model close to the structural phase transitions in perovskite (=347 K) and chiral (=336 K) HyFe and the chiral (=296 K) HyMn. Our results indicate that HyM (M=Fe, Mn) exhibit weak first order or near second order transitions (magnetic transition and the structural phase transitions).
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