Composition and temperature dependence of the thermoelectric power of Ni${}_{2+x}$Mn${}_{1-x}$Ga alloys

Abstract

The thermoelectric power (TEP) measurements have been carried out to investigate the changes in the electronic structure associated with the intermartensitic and martensitic transitions in Ni${}_{2+x}$Mn${}_{1-x}$Ga (0 $\le$ x $\le$ 0.19). The samples have been characterized by a.c. magnetic susceptibility measurements. The correlation between the TEP and the microstructural changes sensitive to the increasing Ni content in Ni${}_{2+x}$Mn${}_{1-x}$Ga has been investigated. The changes in the density of states as reflected in the temperature variation of the TEP are consistent with the conclusions drawn from the Jahn-Teller mechanism of lattice distortion.

arXiv comment11 pages, 5 figures; Accepted for publication in J. Phys. Condens. Matter (2006)

References in corpus (5)

• Phase transitions in Ni2+xMn1-xGa with a high Ni excess
• Premartensitic Transition in Ni2+xMn1-xGa Heusler Alloys
• Observation of a strongly nested Fermi surface in the shape-memory alloy Ni[0.62]Al[0.38]
• A critical discussion of calculated modulated structures, Fermi surface nesting and phonon softening in magnetic shape memory alloys Ni${}_2$Mn(Ga, Ge, Al) and Co${}_2$Mn(Ga, Ge)
• Resistivity and Thermopower of Ni2.19Mn0.81Ga