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    Temperature and field dependences of the magnetization and the magnetic susceptibility in perovskite structures (FMDMn and AceMn) -2
    (B.Verkin Institute for Low Temperature Physics and Engineering of the NAS of Ukraine, 2025) Yurtseven, Hasan Hamit; Kurt, Arzu; Kurt, M.
    Ferromagnetic properties of the perovskite structures, namely, [NH2–CH+–NH2] [Mn(HCOO)3] (FMDMn) and [CH3C(NH2)2] [Mn(HCOO)3] (AceMn), are studied close to magnetic phase transitions. Magnetization M(T) is calculated by the extended mean field model, and M(H) is analyzed for FMDMn near Tc = 8 K. For AceMn, this analysis is performed using M / H(c¢ac) and M(H) near Tc = 9 K. The observed data from the literature are used for the power-law analysis. The critical exponents b, d, and g for M(T), M/H, and M(H), respectively, are determined, which are compared with the expected values from the mean field theory, Ising and Heisenberg models. We find that the Landau mean-field model satisfactorily describes the magnetic behavior of M(T) values for the perovskite FMDMn. Our g and d values are not in agreement with those expected ones. It is indicated that both compounds (FMDMn and AceMn) exhibit weak first-order (or nearly second-order) behavior; in particular, a tricritical magnetic transition is suggested for FMDMn. © H. Yurtseven, A. Kurt, and M. Kurt, 2025.