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The influence of magnetoelastic interaction on structural phase transitions in cubic ferromagnetics
Authors:VD Buchel’nikov  A N Vasil’ev  A T Zayak  P Entel
Institution:(1) Chelyabinsk State University, Chelyabinsk, 454021, Russia;(2) Moscow State University, Vorob’evy gory, Moscow, 119899, Russia;(3) Theoretical Low-Temperature Physics Gerhard-Mercator University, 47048 Duisburg, Germany
Abstract:In the framework of the Landau theory of phase transitions, the influence of the magnetoelastic interaction on structural transitions in cubic ferromagnetics with a positive first magnetic anisotropy constant is analyzed. It is shown that structural transitions are not accompanied by a reorientation of magnetization in this case. The phase diagrams of such ferromagnetics either contain a termination point of the structural transition or a critical point in which the first-order transition is replaced by a second-order one. Magnetoelastic interaction also leads to the appearance of an interval of the ferromagnetic parameters in which a coupled first-order structural-magnetic transition exists. The phase T?x diagram for Heusler Ni2+x Mn1?x Ga alloys is calculated, which is in good agreement with the experimental phase diagram of these alloys.
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