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2006

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/10559

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

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http://dx.doi.org/10.1103/PhysRevB.73.064303

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.

Subject

Transformacions martensítiques, Teoria dels reticles, Fonons

Subject (English)

Martensitic transformations, Lattice theory, Phonons

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Articles publicats en revistes (Física Quàntica i Astrofísica)

Citation

MOYA RAPOSO, Xavier, et al. Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys. Physical Review B. 2006. Vol. 73, num. 6, pags. 064303. ISSN 0163-1829. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/10559

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