Low-temperature specific heat of Ni-Mn-Ga ferromagnetic shape memory alloys

V. A. Chernenko, A. Fujita, S. Besseghini, J. I. Pérez-Landazabal

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Results of the low-temperature specific heat measurements (2-80 K) for one austenitic and three martensitic Ni-Mn-Ga ferromagnetic alloys are presented. The alloy compositions are chosen to comprise a wide span of valence electron concentrations e/a=7.3-7.78. Debye temperature (261-345 K) is found to be an increasing function of e/a while the experimental values of the Sommerfeld coefficient (2.9-3.4 mJ/mol K2) appear to be increasing in the martensitic region only. Observation of those trends rekindles the discussion about the role of vibrational and electronic contributions to the lattice instability and transformation mechanism of studied alloys.

Original languageEnglish
Pages (from-to)e156-e159
JournalJournal of Magnetism and Magnetic Materials
Volume320
Issue number14
DOIs
Publication statusPublished - 2008 Jul 1

Keywords

  • Debye temperature
  • Low-temperature specific heat
  • Ni-Mn-Ga ferromagnetic shape memory alloy
  • Sommerfeld coefficient

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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