Resistivity and Thermopower of Ni2.19Mn0.81Ga

Abstract

In this paper, we report results of the first studies on the thermoelectric power (TEP) of the magnetic heusler alloy Ni${}_{2.19}$Mn${}_{0.81}$Ga. We explain the observed temperature dependence of the TEP in terms of the crystal field (CF) splitting and compare the observed behavior to that of the stoichiometric system Ni${}_2$MnGa. The resistivity as a function of temperature of the two systems serves to define the structural transition temperature, T${}_M$, which is the transition from the high temperature austenitic phase to low temperatures the martensitic phase. Occurrence of magnetic (Curie-Weiss) and the martensitic transition at almost the same temperature in Ni${}_{2.19}$Mn${}_{0.81}$Ga has been explained from TEP to be due to changes in the density of states (DOS) at the Fermi level.

arXiv comment12 pages, 4 figures, Accepted in Physical Review B vol 70, Issue 13

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Cited by in corpus (4)

• Local Atomic Structure of Martensitic Ni${}_{2+x}$Mn${}_{1-x}$Ga: An EXAFS Study
• Temperature dependence of the anomalous Nernst effect in Ni${}_2$MnGa shape memory alloy
• Robust evidence for the stabilization of the premartensite phase in Ni-Mn-In magnetic shape memory alloys by chemical pressure
• Composition and temperature dependence of the thermoelectric power of Ni${}_{2+x}$Mn${}_{1-x}$Ga alloys