Title:
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Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys
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Author:
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Moya Raposo, Xavier; Mañosa, Lluís; Planes Vila, Antoni; Krenke, Thorsten; Acet, Mehmet; Garlea, V. O.; Lograsso, T. A.; Schlagel, D. L.; Zarestky, Jerel L.
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Other authors:
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Universitat de Barcelona |
Abstract:
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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. |
Subject(s):
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-Transformacions martensítiques -Teoria dels reticles -Fonons -Martensitic transformations -Lattice theory -Phonons |
Rights:
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(c) The American Physical Society, 2006
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Document type:
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Article Article - Published version |
Published by:
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The American Physical Society
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