X-ray Powder Diffraction Studies of Mn3Ga0.97Al0.03C in Magnetic Fields

Keiichi Koyama; Takeshi Kanomata; Tatsuo Watanabe; Takanobu Suzuki; Hironori Nishihara; Kazuo Watanabe

doi:10.2320/matertrans.47.492

X-ray Powder Diffraction Studies of Mn₃Ga_0.97Al_0.03C in Magnetic Fields

Keiichi Koyama, Takeshi Kanomata, Tatsuo Watanabe, Takanobu Suzuki, Hironori Nishihara, Kazuo Watanabe

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Keywords: Mn₃GaC, magnetic phase transition, field-induced structural transformation, high field X-ray diffraction

JOURNAL FREE ACCESS

2006 Volume 47 Issue 3 Pages 492-495

DOI https://doi.org/10.2320/matertrans.47.492

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Abstract

We have performed the X-ray powder diffraction measurements for Mn₃Ga_0.97Al_0.03C with a perovskite-type structure in the temperature range from 8 to 320 K in magnetic fields up to 5 T, in order to investigate the structural properties affected by the magnetic field. The compound has a successive magnetic phase transition below 160 K: the ferromagnetic (F)–intermediate (I)–antiferromagnetic (AF) phases for cooling process. The lattice parameter a abruptly increases by 0.23%, accompanied by the transition from the I to AF phases at T_AF–I=130 K. In addition, we clearly observed that magnetic field induces the I phase with small a and suppresses the AF phase with large a below T_AF–I.

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