Normal and inverse magnetocaloric effect in colossal magnetoresistive electron-doped manganites R0.15Ca0.85MnO3 (R = Y, Gd and Dy)

Magnetocaloric effect and critical behavior near the first to second-order phase transition of La0.7Ca0.3−xSnxMnO3 compounds

“…It is known that the hole doped perovskite manganite La 0.7 Ca 0.3 MnO 3 is a typical material exhibiting a colossal magnetoresistance (CMR) and a magnetocaloric effect (MCE) with high values magnetoresistance (MR) and magnetic entropy change (ΔS m ), respectively. These values are almost larger than those obtained on the other manganites [1][2][3][4][5][6][7]. Nevertheless, La 0.7 Ca 0.3 MnO 3 polycrystalline or single crystal bulk sample is a first-order phase transition (FOPT) material [8][9][10][11].…”

“…Here, M i and M f are corresponding to the first and end values of magnetization at FM-PM phase transition; B and S c are magnetization sensitivity dM/dT at FM state before transition and at T C , respectively. Clearly, our experimental data (symbols) measured at H=10 kOe for samples can be well fit by equation(1). Numerical calculation was made using the parameters listed in table 2.To further understand the magnetic properties, we have recorded the isothermal magnetization M(H) curves at temperatures around the FM-PM phase transition with a step of 2 K.Figures 3(c) and (d)show Arrott…”