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Influence of chemical pressure in Sn-substituted Ni2MnGa Heusler alloy: Experimental and theoretical studies
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View: Figures


Image of FIG. 1.
FIG. 1.

Room temperature x-ray patterns for the Ni2MnGa1−xSnx Heusler-type alloys (x-values are indicated). L21-type (blue spheres-X, red spheres-Y and white spheres-Z) crystal structure and Rietveld refined profile are also shown in inset figures.

Image of FIG. 2.
FIG. 2.

Behavior of the L21-structural lattice parameter as a function of the Sn-content in Ni2MnGa1−xSnx Heusler-type alloys. Full-square symbols are experimental data, while the open symbols are values obtained theoretically. The line connecting the points is a guide for eyes.

Image of FIG. 3.
FIG. 3.

(a) Total magnetic moment (μtotal – open circles) and Mn-magnetic moment (μMn) behaviors of the L21-type structure obtained from DFT-calculations (b) M(H) curves recorded at 300 K, (c) maximum magnetization obtained at 300 K under 3 T from (b) and (d) the Curie temperature (TC A) as a function of the Sn-content (or as a function of the (e/a)-quantity). The lines are guides for eyes. μtotal –theoretical values were calculated assuming 2-Ni and 1-Mn atoms per L21-unit cell. TC A-values are considered at the inflexion point of the M(T) curve in the A-state.

Image of FIG. 4.
FIG. 4.

(a) FC-M(T) and FH-M(T) curves obtained for the Ni2MnGa Heusler alloy for a probe field of 5 mT. The quantities shown in this figure are defined in the text. (b) FC-M(T) and FH-M(T) curves recorded for different applied field values. Five consecutive M(T)-thermal cycles obtained under 5 mT.

Image of FIG. 5.
FIG. 5.

(a) FC-M(T) curves obtained for the Ni2MnGa1−xSnx Heusler-type alloys, where the x-values are also shown in this figure, (b) ΔM/M and TMi as a function of the e/a obtained for samples that shown MPT.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of chemical pressure in Sn-substituted Ni2MnGa Heusler alloy: Experimental and theoretical studies