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Structural, magnetic, electrical transport properties, and reversible room-temperature magnetocaloric effect in antipervoskite compound
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Room temperature x-ray powder diffraction pattern (circle) and Rietveld refinement pattern (solid line) of . The vertical marks indicate the position of Bragg peaks, and the solid line at the bottom corresponding to the difference between observed and calculated intensities. Inset shows the sketch map of the crystal structure of antiperovskite compound; (b) XRD patterns of at several selected temperatures (100, 200, 250, 275, 285, 290, and 295 K); inset shows the temperature dependent lattice constant. The Bragg peaks of Cu impurity come from the substrate materials.

Image of FIG. 2.
FIG. 2.

Temperature dependence of magnetization in ZFC and FC processes at 100 Oe from 5 to 380 K. Inset: isotherm magnetization curve at 5 K with field up to 45 kOe.

Image of FIG. 3.
FIG. 3.

(a) Temperature dependent of resistivity for at 0 and 50 kOe. Inset shows the values of vs at 50 kOe. (b) vs at zero field and its linear fitting to lower temperature data; Inset show the linear fitting between 130 and 270 K (in the left hand) and the enlargement of Fig. 3(b) below 130 K (in the right hand).

Image of FIG. 4.
FIG. 4.

(a) Isotherm magnetization curves for covering a broad temperature range of 145–340 K with external magnetic fields up to 45 kOe; (b) Arrott plots deduced from curves in Fig. 3(a). Inset of Fig. 3(b): curves under increasing/decreasing magnetic field at several selected temperatures (280, 290, and 300 K).

Image of FIG. 5.
FIG. 5.

(a) Magnetic entropy change as a function of temperature at different magnetic field changes in , 5, 10, 20, 30, 40, and 45 kOe for . Inset shows the maximum magnetic entropy change at as a function of for . The solid line shows the liner fit to the experimental data; (b) the curve for magnetic field change . The shaded area is the RCP. The inset of Fig. 4(b) shows the magnetic field dependence of the relative power.

Image of FIG. 6.
FIG. 6.

Temperature dependence of the adiabatic temperature change for under different magnetic fields of 10 kOe, 20 kOe, 30 kOe, 40 kOe, and 45 kOe, respectively. The inset shows the zero-field heat capacity of .

Image of FIG. 7.
FIG. 7.

(a) Temperature dependence of parameters (in the left hand) and (in the right hand) where the parameters and are the magnetoelastic coupling part and electron interaction part of the Gibbs free energy, respectively; the dashed line indicates and the crossing point is corresponding to ; (b) the calculated (in the left hand) and experimental values (in the right hand) of magnetic entropy change as a function of temperature under field change and 45 kOe, respectively; (c) temperature dependent thermopower for between 140 K and 360 K at zero field. Inset shows the from 5 to 360 K. The red dashed line indicates .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural, magnetic, electrical transport properties, and reversible room-temperature magnetocaloric effect in antipervoskite compound AlCMn3