2026-04-13T07:25:28Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/105592025-12-05T16:39:26Zcom_2072_1057col_2072_478823col_2072_478917

Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys Moya Raposo, Xavier Mañosa, Lluís Planes Vila, Antoni Krenke, Thorsten Acet, Mehmet Garlea, V. O. Lograsso, T. A. Schlagel, D. L. Zarestky, Jerel L. Transformacions martensítiques Teoria dels reticles Fonons Martensitic transformations Lattice theory Phonons 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. 2009-12-28T09:19:37Z 2009-12-28T09:19:37Z 2006 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0163-1829 https://hdl.handle.net/2445/10559 540296 eng Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.73.064303 Physical Review B, 2006, vol. 73, núm. 6, p. 064303.1-064303.6 http://dx.doi.org/10.1103/PhysRevB.73.064303 (c) The American Physical Society, 2006 info:eu-repo/semantics/openAccess 6 p. application/pdf The American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)