X-ray diffraction study of the structural phase transition in MnAs under high magnetic fields

Fumihiro Ishikawa, Keiichi Koyama, Kazuo Watanabe, Hirofumi Wada

研究成果: Conference article査読

8 被引用数 (Scopus)

抄録

The structural phase transition induced by magnetic fields on MnAs was observed by the X-ray diffraction measurements in high magnetic fields up to 4 T. Magnetization measurements showed that Curie temperature TC was 315.5 K for increasing temperatures and a metamagnetic transition from the paramagnetic to the ferromagnetic state occurred above TC. The structural transformation from the hexagonal NiAs-type to the orthorhombic MnP-type structure was confirmed at TC with increasing temperature from 290 to 319 K via two-phase coexistence region. The X-ray diffraction profiles at 319 K showed the single phase of the MnP-type structure in zero field and applying magnetic field of 3 T caused appearance of the Brag peak of the hexagonal structure. On further increase of magnetic fields, the single phase of the hexagonal structure was observed above 3.5 T in the forced ferromagnetic state. Both the magnetic and structural transitions induced by magnetic fields above TC were first order with a hysteresis and had a close relationship between each other.

本文言語English
ページ(範囲)408-412
ページ数5
ジャーナルPhysica B: Condensed Matter
346-347
1-4
DOI
出版ステータスPublished - 2004 4 30
イベントProceedings of the 7th International Symposium on Research - Toulouse, France
継続期間: 2003 7 202003 7 23

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学
  • 電子工学および電気工学

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