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Title: Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys
Author: Moya Raposo, Xavier
Mañosa, Lluís
Planes Vila, Antoni
Krenke, Thorsten
Acet, Mehmet
Garlea, V. O.
Lograsso, T. A.
Schlagel, D. L.
Zarestky, Jerel L.
Keywords: Transformacions martensítiques
Teoria dels reticles
Martensitic transformations
Lattice theory
Issue Date: 2006
Publisher: The American Physical Society
Abstract: Inelastic and elastic neutron scattering have been used to study a single crystal of the Ni$_{54}$Mn$_{23}$Al$_{23}$ Heusler alloy over a broad temperature range. The paper reports the first experimental determination of the low-lying phonon dispersion curves for this alloy system. We find that the frequencies of the TA$_2$ modes are relatively low. This branch exhibits an anomaly (dip) at a wave number $\xi_{0} ={1/3}\approx 0.33$, which softens with decreasing temperature. Associated with this anomalous dip at $\xi_{0}$, an elastic central peak scattering is also present. We have also observed satellites due to the magnetic ordering.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i
It is part of: Physical Review B, 2006, vol. 73, núm. 6, p. 064303.1-064303.6
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ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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