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Incommensurate structures of intermediate phase and martensite phase in Ni$$_{2}$$MnGa

Ni$$_{2}$$MnGaにおける中間相及びマルテンサイト相の非整合構造

串田 悠彰*; 福田 康太*; 寺井 智之*; 福田 敬*; 掛下 知行*; 大庭 卓也*; 長壁 豊隆 ; 加倉井 和久; 加藤 健一*

Kushida, Hiroaki*; Fukuda, Kodai*; Terai, Tomoyuki*; Fukuda, Takashi*; Kakeshita, Tomoyuki*; Oba, Takuya*; Osakabe, Toyotaka; Kakurai, Kazuhisa; Kato, Kenichi*

Neutron diffraction measurements using single crystal and powder synchrotron X-ray diffraction measurements revealed that an intermediate (I-) phase and a martensite (M-) phase in Ni$$_{2}$$MnGa have incommensurate modulated structures. The modulation vectors of the I- and M-phases are nearly equal to $$q$$ = 0.341 at 210 K and $$q$$ = 0.427 at 100 K, respectively. Moreover, displacements of Ni, Mn and Ga atoms in both the I- and M-phase are expressed by sinusoidal waves with the same phase and almost the same amplitudes.

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