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Structural relation between the X-phase and other phases in Ni$$_{2}$$MnGa

Ni$$_{2}$$MnGaにおけるX相と他の秩序相との構造相関

掛下 知行*; 福田 隆*; 寺井 智之*; 長壁 豊隆  ; 加倉井 和久

Kakeshita, Tomoyuki*; Fukuda, Takashi*; Terai, Tomoyuki*; Osakabe, Toyotaka; Kakurai, Kazuhisa

Ni$$_{2}$$MnGaのX相と他の秩序相との構造相関について研究を行った。その結果、中間相とX相の相転移では、一軸応力下で不連続な転移が観測される一方、ゼロ応力下では、転移は連続であった。また、X相からL2$$_{1}$$型の母相への転移は、連続であった。これらの結果は、Ni$$_{2}$$MnGaの多重臨界点の存在を意味している。

We have investigated stress and temperature dependences of the structure of the X-phase in Ni$$_{2}$$MnGa to understand structural relation between the X-phase and other phases. We found that the structure change associated with the transformation from the intermediate (I-) phase to the X-phase is discontinuous under a compressive stress, while it is continuous under zero stress. In addition, the transformation from the X-phase to the L2$$_{1}$$-type parent phase is continuous regardless of applied stress. These results strongly suggest the existence of multi-critical point in Ni$$_{2}$$MnGa.

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