1 research outputs found
Resistivity and Thermopower of Ni2.19Mn0.81Ga
In this paper, we report results of the first studies on the thermoelectric
power (TEP) of the magnetic heusler alloy NiMnGa. 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 NiMnGa. The resistivity as a function of temperature of the two
systems serves to define the structural transition temperature, T, 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 NiMnGa has been
explained from TEP to be due to changes in the density of states (DOS) at the
Fermi level.Comment: 12 pages, 4 figures, Accepted in Physical Review B vol 70, Issue 1