Observed (solid circles) and calculated (solid line) XRD patterns of La0.6Sr0.2Ba0.2−X□XMnO3 (x = 0.0 and x = 0.1) at room temperature. The difference between these spectra is plotted at the bottom. Bragg reflections are indicated by ticks.
Ba deficient dependences of the lattice parameters a, b, and c and variation of 〈Mn–O–Mn〉 angles and 〈Mn–O〉 lengths as a function of deficient content.
Magnetization measurements as a function of temperature for La0.6Sr0.2Ba0.2−X◻XMnO3 (x = 0.00, 0.05, 0.10, and 0.15) samples under 0.05 T. The inset shows the plot of dM/dT versus T and TC versus x.
Isothermal magnetization M(H) for La0.6Sr0.2Ba0.2−X□XMnO3 samples at several temperatures: (a) x = 0.00 and (b) x = 0.15.
Arrot curves M2 versus μ 0 H/M for La0.6Sr0.2Ba0.2−X□XMnO3 samples: (a) x = 0.05 and (b) x = 0.1.
Spontaneous magnetization and inverse of susceptibility versus T for La0.6Sr0.2Ba0.2MnO3. The inset shows the ln-ln plot for determining the critical exponent β and γ.
M vs μ 0H isotherm measured at TC = 350 K. The inset shows the ln-ln plot for determining the critical exponent δ and modified Arrott plot for La0.6Sr0.2Ba0.2MnO3.
Magnetic entropy change versus temperature for the La0.6Sr0.2Ba0.2−X□XMnO3 samples at several magnetic applied field changes: (a) x = 0.00, (b) x = 0.05, (c) x = 0.10, and (d) x = 0.15.
Experimental and theoretical magnetic entropy change ΔSM for x = 0.05 for ΔH = 1 T and 3 T. The insets show the temperature dependence of Landau coefficients A(T), B(T), and C(T). The units forA(T), B(T), and C(T) are T2 kg/J, T4 kg3/J3, and T6 kg5/J5, respectively.
Refined structural parameters of La0.6Sr0.2Ba0.2−X□XMnO3 (0.0 ≤ x ≤ 0.15) compounds at room temperature.
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