Evidence of change in the density of states during the martensitic phase transformation of Ni-Mn-In metamagnetic shape memory alloys

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Abstract

Specific heat measurements were performed at low temperatures for Ni50Mn50−xInx alloys to determine their Debye temperatures (θD) and electronic specific heat coefficients (γ). For x ≤ 15, where the ground state is the martensite (M) phase, θD decreases linearly and γ increases slightly with increasing In content. For x ≥ 16.2, where the ground state is the ferromagnetic parent (P) phase, γ increases with decreasing In content. Extrapolations of the composition dependences of θD and γ in both the phases suggest that these values change discontinuously during the martensitic phase transformation. The value of θD in the M phase is larger than that in the P phase. The behavior is in accordance with the fact that the volume of the M phase is more compressive than that of the P phase. On the other hand, γ is slightly larger in the P phase, in good agreement with the reported density of states around the Fermi energy obtained by the first-principle calculations.

Original languageEnglish
Article number414
JournalMetals
Volume7
Issue number10
DOIs
Publication statusPublished - 2017 Oct

Keywords

  • Density of states
  • Electronic specific heat coefficient
  • Martensitic phase transformation
  • Shape memory alloy

ASJC Scopus subject areas

  • Materials Science(all)

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