Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys

Xavier Moya, Lluís Mañosa, Antoni Planes, Thorsten Krenke, Mehmet Acet, V. O. Garlea, T. A. Lograsso, D. L. Schlagel, J. L. Zarestky

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Abstract

Inelastic and elastic neutron scattering have been used to study a single crystal of the Ni54 Mn23 Al23 Heusler alloy over a broad temperature range. The paper reports the experimental determination of the low-lying phonon dispersion curves for this alloy system. We find that the frequencies of the TA2 modes are relatively low. This branch exhibits an anomaly (dip) at a wave number ξ0 =1 3 0.33, which softens with decreasing temperature. Associated with this anomalous dip at ξ0, an elastic central peak scattering is also present. We have also observed satellites due to the magnetic ordering.

Original languageEnglish
Article number064303
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume73
Issue number6
DOIs
StatePublished - 2006
Externally publishedYes

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