Yurtseven, H.Dogan, E. Kilit2025-05-102025-05-1020220015-01931563-511210.1080/00150193.2022.21157992-s2.0-85143197606https://doi.org/10.1080/00150193.2022.2115799https://hdl.handle.net/20.500.14720/10260Temperature dependence of the magnetization M(T) is calculated for [NH2 NH3][M(HCOO)(3)] (M=Fe, Mn), namely, HyFe (perovskite and chiral) below T m =12.5 K and, for HyMn (chiral) below and above T m =7.9 K (at 100 Oe) by the molecular field theory (MFT). Close to the magnetic transition temperature ( T m ), 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 ( T C =347 K) and chiral ( T C =336 K) HyFe and the chiral ( T C =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).eninfo:eu-repo/semantics/closedAccessMagnetization M(TH)Heat Capacity Cp(T)Molecular Field TheoryAn Ising ModelPower-Law AnalysisHym (M=FeMn)Article6001Q4Q47387WOS:000894426900007