Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-03-09
Physics
Condensed Matter
Strongly Correlated Electrons
12 pages, 4 figures, Accepted in Physical Review B vol 70, Issue 13
Scientific paper
10.1103/PhysRevB.70.132408
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.
Bhobe P. A.
Paudel Rajkumar
Priolkar K. R.
Sapeco Shannol Dias
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