Journal or Book Title
Physical Review B
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.
American Physical Society
Siewert, M.; Gruner, M. E.; Dannenberg, A.; Hucht, A.; Shapiro, S. M.; Xu, G.; Lograsso, Thomas A.; and Entel, P., "Electronic structure and lattice dynamics of the magnetic shape-memory alloy Co2NiGa" (2010). Ames Laboratory Publications. 45.