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Temperature dependence of the magnetization  M ( T ) is calculated for [NH 2  NH 3 ][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).

Calculation of the magnetization and the heat capacity for [NH 2 NH 3 ][M(HCOO) 3 ] ( M =Fe, Mn) near the phase transitions