Competition fluctuations and hysteresis in manganites in magnetic fields near Tc

Influence of fluctuations in the specific heat, Cp, of Sm0.55Sr0.45MnO3 manganite was first observed near temperature of magnetic phase transition Tc. Temperature dependencies of the specific heat both in zero field and in magnetic field show a new type of hysteresis akin to that in ferromagnetics, origin from different values of Tc in ferromagnetic and paramagnetic states of Sm0.55Sr0.45MnO3. Studying the specific heat of Sm0.55Sr0.45MnO3 manganite in magnetic fields allow find the finite-size scaling from one to three dimensions of fluctuation space at approaching Tc