Phase transitions in Ni-Mn-Ga alloys with the account of crystal lattice modulation

V. D. Buchelnikov, S. V. Taskaev, M. A. Zagrebin, A. T. Zayak, T. Takagi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Using the Ginzburg-Landau theory, phenomenological phase diagrams of Heusler alloys Ni-Mn-Ga are theoretically investigated. We take into account the magnetic, elastic and micro-modulation order parameters in order to understand their coupling in the real system. We focus on the aspect of crystal modulation which appears at c/a<1 only, and is never observed for tetragonal distortions characterized by c/a>1. The influences of the parameters are discussed on the basis of phase diagrams. From different phase diagrams we choose those corresponding to the experimental situation and draw a conclusion that two opposite tetragonal distortions, c/a<1 and c/a>1, must be driven by different instabilities having different microscopic origins.

Original languageEnglish
Pages (from-to)e591-e594
JournalJournal of Magnetism and Magnetic Materials
Volume316
Issue number2 SPEC. ISS.
DOIs
Publication statusPublished - 2007 Sep

Keywords

  • Ferromagnetic shape memory alloys
  • Modulation of the crystal lattice
  • Structural and magnetic phase transitions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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