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

Fumihiro Ishikawa, Keiichi Koyama, Kazuo Watanabe, Hirofumi Wada

Research output: Contribution to journalConference articlepeer-review

7 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)408-412
Number of pages5
JournalPhysica B: Condensed Matter
Volume346-347
Issue number1-4
DOIs
Publication statusPublished - 2004 Apr 30
EventProceedings of the 7th International Symposium on Research - Toulouse, France
Duration: 2003 Jul 202003 Jul 23

Keywords

  • Metamagnetic transition
  • MnAs
  • Structural transformation
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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