Martensitic Transformation Temperatures and Hall Effect in Ni47−xMn41+xIn12 (x = 0, 1, 2) Alloys

Abstract

At present, the question of the relationship between the characteristic martensitic transformation temperatures (MTT) and the electronic parameters of a system has not been fully studied. In the present work, an attempt to establish a similar relationship using the example of the concentration of charge carriers, n, was made. The field dependences of Hall resistivity ρH and magnetization M of the magnetocaloric Ni47−xMn41+xIn12 (x = 0, 1, 2) alloys were measured at T = 4.2 K and in magnetic fields of up to 80 kOe. The MTT were obtained from the temperature dependences of electrical resistivity and magnetization. It was observed that the MTT correlate strongly with both the valence electron concentration e/a and the electronic transport characteristics, which are the coefficient of the normal (NHE) R0 and anomalous (AHE) RS Hall effect and the concentration of charge carriers n.

Inverse Magnetocaloric Effect in Heusler Ni44.4Mn36.2Sn14.9Cu4.5 Alloy at Low Temperatures

“…Significant inverse MCE can be observed in several ferromagnetic (FM) Heusler alloys based on Ni-Mn-Z (Z = In, Sn, Sb), but they usually show the effect closer to room temperature [17][18][19][20][21][22]. Some Heusler alloy compositions show the inverse MCE at low temperatures, for example, the Ni(-Co)-Mn-Ti Heusler alloys [23].…”

Structural, Magnetocaloric, and Magnetic Properties in Heusler Ni50Mn35In10X5 (X = Ga, Fe and Al) Alloys

“…Great consideration has been committed to the study of materials that show reasonable values of magnetic entropy change (∆S M ) because they may be used as magnetic refrigerant materials at close to room temperature (RT) [1,2]. Heusler Ni-Mn-In alloys that undergo first-order temperature-instigated structural/martensitic transitions around RT have drawn interest because of their remarkable magneto-responsive properties, like the giant magnetocaloric effect (MCE), the shape memory effect (SM), exchange bias (EB), and large magnetoresistance (MR) [3][4][5][6][7][8][9]. One of their potential applications is in magnetic refrigeration systems, in which the application of an external magnetic field produces changes in the material associated with the extraction or transfer of heat.…”