Electronic structure and lattice dynamics of the magnetic shape-memory alloy Co2NiGa

Date
2010-08-20
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Siewert, M.
Lograsso, Thomas
Gruner, M.
Dannenberg, A.
Hucht, A.
Shapiro, S.
Xu, G.
Lograsso, Thomas
Entel, P.
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Ames Laboratory
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Ames Laboratory
Abstract

In addition to the prototypical Ni-Mn-based Heusler alloys, the Co-Ni-Ga systems have recently been suggested as another prospective materials class for magnetic shape-memory applications. We provide a characterization of the dynamical properties of this material and their relation to the electronic structure within a combined experimental and theoretical approach. This relies on inelastic neutron scattering to obtain the phonon dispersion while first-principles calculations provide the link between dynamical properties and electronic structure. In contrast to Ni2MnGa, where the softening of the TA2 phonon branch is related to Fermi-surface nesting, our results reveal that the respective anomalies are absent in Co-Ni-Ga, in the phonon dispersions as well as in the electronic structure.

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This article is from Physical Review B 82 (2010): 064420, doi:10.1103/PhysRevB.82.064420.

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