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Lattice dynamics in magnetic superelastic Ni-Mn-In alloys: Neutron scattering and ultrasonic experiments
Physical Review B
  • Xavier Moya, Universitat de Barcelona
  • David González-Alonso, Universitat de Barcelona
  • Lluís Mañosa, Universitat de Barcelona
  • Antoni Planes, Universitat de Barcelona
  • V. O. Garlea, Iowa State University
  • Thomas A. Lograsso, Iowa State University
  • Deborah L. Schlagel, Iowa State University
  • Jerel L. Zarestky, Iowa State University
  • Seda Aksoy, Universität Duisburg-Essen
  • Mehmed Acet, Universität Duisburg-Essen
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Neutron scattering and ultrasonic methods have been used to study the lattice dynamics of two single crystals of Ni-Mn-In Heusler alloys close to Ni50Mn34In16 magnetic superelastic composition. The paper reports on the experimental determination of the low-lying phonon-dispersion curves and the elastic constants for this alloy system. We found that the frequencies of the TA2 branch are relatively low and it exhibits a small dip anomaly at a wave number ξ0≈1/3, which softens with decreasing temperature. Associated with the softening of this phonon, we also observed the softening of the shear elastic constant C′=(C11−C12)/2. Both temperature softenings are typical for bcc-based solids which undergo martensitic transformations and reflect the dynamical instability of the cubic lattice against shearing of {110} planes along ⟨11̅ 0⟩ directions. Additionally, we measured low-lying phonon-dispersion branches and elastic constants in applied magnetic fields aimed to characterize the magnetoelastic coupling.

This article is from Physical Review B 79 (2009): 214118, doi:10.1103/PhysRevB.79.214118.

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American Physical Society
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Xavier Moya, David González-Alonso, Lluís Mañosa, Antoni Planes, et al.. "Lattice dynamics in magnetic superelastic Ni-Mn-In alloys: Neutron scattering and ultrasonic experiments" Physical Review B Vol. 79 Iss. 21 (2009) p. 214118
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