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Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys
Physical Review B
  • Xavier Moya, Universitat de Barcelona
  • Lluís Mañosa, Universitat de Barcelona
  • Antoni Planes, Universitat de Barcelona
  • Thorsten Krenke, Universität Duisburg-Essen
  • Mehmet Acet, Universität Duisburg-Essen
  • V. O. Garlea, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • Jerel L. Zarestky, Iowa State University
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Inelastic and elastic neutron scattering have been used to study a single crystal of the Ni54Mn23Al23 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 numberξ0=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.

This article is from Physical Review B 73 (2006): 064303, doi:10.1103/PhysRevB.73.064303.

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American Physical Society
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Xavier Moya, Lluís Mañosa, Antoni Planes, Thorsten Krenke, et al.. "Lattice dynamics and phonon softening in Ni-Mn-Al Heusler alloys" Physical Review B Vol. 73 Iss. 6 (2006) p. 064303
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