Electronic structure and lattice dynamics of the magnetic shape-memory alloy Co2NiGa
| Title | Electronic structure and lattice dynamics of the magnetic shape-memory alloy Co2NiGa |
| Publication Type | Journal Article |
| Year of Publication | 2010 |
| Authors | Siewert M, Gruner ME, Dannenberg A, Hucht A, Shapiro SM, Xu G, Schlagel DL, Lograsso TA, Entel P |
| Journal Title | Physical Review B |
| Volume | 82 |
| Pages | 064420 |
| Date Published | 8/20 |
| ISBN Number | 1098-0121 |
| Accession Number | ISI:000281064300005 |
| Keywords | ab-initio, augmented-wave method, co-ni-ga, crystal-structures, HEUSLER ALLOYS, invar-alloys, martensitic phase-transition, phonon-dispersion, single-crystals, SITE PREFERENCE |
| 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 TA(2) 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. |
| URL | <Go to ISI>://000281064300005 |
| DOI | 10.1103/Physrevb.82.064420 |
