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Tunable spin reorientation transition and magnetocaloric effect in Sm0.7−xLaxSr0.3MnO3 series
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Image of FIG. 1.
FIG. 1.

X-ray diffraction pattern of Sm0.7−xLaxSr0.3MnO3 (x = 0–0.7) compounds.

Image of FIG. 2.
FIG. 2.

Phase diagram for Sm0.7−xLaxSr0.3MnO3 (x = 0–0.7) as a function of tolerance factor t and composition x. Tc and T* correspond to ferromagnetic Curie temperature of the Mn-sublattice and occurrence of a cusp in the field-cooled magnetization measured at μ0 H = 1 kOe, respectively.

Image of FIG. 3.
FIG. 3.

(a) Temperature dependence of the resistivity ρ(T) of x = 0–0.6 in zero magnetic field. The inset shows the activation energy for polaron hopping with varying x. (b) ln(ρ/T) versus 1/T plots with linear fit at high temperatures for x = 0 and 0.1.

Image of FIG. 4.
FIG. 4.

(a) Field-cooled magnetization M(T) for x = 0–0.7 under H = 1 kOe. (b) M(H) at 10 K for x = 0, 0.1, 0.4, and 0.6. The inset (i) shows dependence of magnetization value at 5 T at 10 K on composition. The inset (ii) shows Tc and T* as a function of composition x.

Image of FIG. 5.
FIG. 5.

M(H) plots at selected temperatures for x = (a) 0, (b) 0.1, (c) 0.5, and (d) 0.6 compounds.

Image of FIG. 6.
FIG. 6.

Temperature dependence of the magnetic entropy (ΔSm ) obtained from M(H) data at μ0ΔH = (a) 1 T and (b) 5 T for x = 0 to 0.7. Inset shows the variation of maximum magnetic entropy with magnetic field for all compositions.

Image of FIG. 7.
FIG. 7.

Values of (a) ΔSm at Tc and (b) refrigerant capacity (RC) for μ0ΔH = 1, 2, and 5 T and (c) Tc as a function of composition x. (d) Normalized ΔSm versus T/Tc for different x.

Image of FIG. 8.
FIG. 8.

Arrott plots (μ0 H/M vs. M 2) of isothermal magnetization. Inset shows isothermal (−ΔS m) vs M 2 curve of Sm0.1La0.6Sr0.3MnO3.

Image of FIG. 9.
FIG. 9.

(a) Spontaneous magnetization and inverse initial susceptibility deduced by extrapolating Arrott plot (μ0 H/M vs. M 2) to μ0 H = 0 and M 2 = 0, respectively. Solid lines are best fits to the equations M s(T) = M 0| ε |β and χ0 −1 (T) = (h0 /M0 )εγ . (b) Spontaneous magnetization of Sm0.1La0.6Sr0.3MnO3 estimated from (−ΔS m) vs M 2 curve and Arrott plots.

Image of FIG. 10.
FIG. 10.

Normalised ΔSm versus normalized temperature θ for different applied magnetic fields for Sm0.1La0.6Sr0.3MnO3.


Generic image for table
Table I.

Structural parameters calculated from X-ray diffraction data. BL is the average Mn-O bond length.

Generic image for table
Table II.

Ferromagnetic Curie temperature (TC ), activation energy (Eρ), maximum entropy change (ΔSm ), and refrigerant capacity (RC) for different compositions.

Generic image for table
Table III.

Magnetocaloric parameters at the Curie temperature TC for different manganites.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tunable spin reorientation transition and magnetocaloric effect in Sm0.7−xLaxSr0.3MnO3 series