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.
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