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Tuning martensitic transformation and large magnetoresistance in Ni50− x Cu x Mn38Sn12 Heusler alloys
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Image of FIG. 1.
FIG. 1.

Room temperature X-ray diffraction patterns of Ni CuMnSn alloys with  = 0, 2, 4, 6. The crystal structures of NiMnSn and NiCuMnSn are 10 M modulated martensitic structures with an orthorhombic unit cell. The crystal structure of NiCuMnSn is 2. The pattern of NiCuMnSn contains two sets of diffraction peaks indicating that both the martensitic and austenitic phase coexistence in NiCuMnSn. The 2 structure with four interpenetrating fcc sublattices, denoted as A, B, C, and D, respectively, is shown in the top right corner.

Image of FIG. 2.
FIG. 2.

The curves under 0.05 T of Ni CuMnSn alloys ( = 0, 2, 4, 6) in ZFC, FCW, and FCC sequences. Curie temperature () is determined from the minimum of curves. The inset figure is an expanded view of martensitic transformation region for NiMnSn.

Image of FIG. 3.
FIG. 3.

Magnetization hysteresis loops of NiCuMnSn alloy measured at low temperatures of 10 K, 30 K, and 60 K, respectively. Prior to each loop measurement, the sample were prepared in field cooling of 1 T.

Image of FIG. 4.
FIG. 4.

The temperature dependence of the resistance of Ni CuMnSn alloys ( = 2, 4, 6) measured under 0 and 5 T in the temperature range from 200 K to 340 K.

Image of FIG. 5.
FIG. 5.

Magnetoresistance as a function of temperature measured at 5 T for Ni CuMnSn alloys ( = 2, 4, 6) during heating process.

Image of FIG. 6.
FIG. 6.

Magnetoresistance as a function of field strength measured at various temperatures for NiCuMnSn. Prior to each curve measurements, the sample was first cooled in zero field to 200 K to obtain a complete martensitic state and then heated to the measuring temperature.


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Table I.

Crystal structures and lattice parameters of Ni CuMnSn alloys measured at room temperature. There are two phases coexisting in NiCuMnSn.

Generic image for table
Table II.

The characteristic temperatures of Ni CuMnSn alloys ( = 0, 2, 4, 6) denoted as , , and , respectively. e/a is the valence electron concentration per atom determined as the concentration-weighted average of the valence electrons. The magnetic properties of austenitic phase and martensitic phase in the vicinity of martensitic transformation region are also listed in this table. is the shift of martensitic transformation temperature under 5 T.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tuning martensitic transformation and large magnetoresistance in Ni50−xCuxMn38Sn12 Heusler alloys