Field induced structural transformation in MnAs

Fumihiro Ishikawa; Keiichi Koyama; Kazuo Watanabe; Hirofumi Wada

doi:10.1143/jjap.42.l918

Field induced structural transformation in MnAs

Fumihiro Ishikawa, Keiichi Koyama, Kazuo Watanabe, Hirofumi Wada

Research output: Contribution to journal › Letter › peer-review

34 Citations (Scopus)

Abstract

The structural phase transition induced by magnetic fields on the ferromagnetic compound MnAs was observed by the X-ray diffraction measurements in high magnetic fields up to 4 T. Magnetization measurements showed that Curie temperature T_C was 315.5 K for increasing temperatures and a metamagnetic transition from the paramagnetic to the ferromagnetic state occurred above T_C. The structural transformation from the hexagonal NiAs-type to the orthohombic MnP-type structure was confirmed at T_C with increasing temperature from 290 K. The X-ray profiles at 319 K in the magnetic field showed that the hexagonal structure phase appeared with increasing fields and coexisted with the orthorhombic one. 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 T_C were first order with a hysteresis and had a close relationship between each other.

Original language	English
Pages (from-to)	L918-L920
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	42
Issue number	8 A
DOIs	https://doi.org/10.1143/jjap.42.l918
Publication status	Published - Aug 1 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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10.1143/jjap.42.l918

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title = "Field induced structural transformation in MnAs",

abstract = "The structural phase transition induced by magnetic fields on the ferromagnetic compound 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 orthohombic MnP-type structure was confirmed at TC with increasing temperature from 290 K. The X-ray profiles at 319 K in the magnetic field showed that the hexagonal structure phase appeared with increasing fields and coexisted with the orthorhombic one. 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.",

author = "Fumihiro Ishikawa and Keiichi Koyama and Kazuo Watanabe and Hirofumi Wada",

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TY - JOUR

T1 - Field induced structural transformation in MnAs

AU - Ishikawa, Fumihiro

AU - Koyama, Keiichi

AU - Watanabe, Kazuo

AU - Wada, Hirofumi

PY - 2003/8/1

Y1 - 2003/8/1

N2 - The structural phase transition induced by magnetic fields on the ferromagnetic compound 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 orthohombic MnP-type structure was confirmed at TC with increasing temperature from 290 K. The X-ray profiles at 319 K in the magnetic field showed that the hexagonal structure phase appeared with increasing fields and coexisted with the orthorhombic one. 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.

AB - The structural phase transition induced by magnetic fields on the ferromagnetic compound 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 orthohombic MnP-type structure was confirmed at TC with increasing temperature from 290 K. The X-ray profiles at 319 K in the magnetic field showed that the hexagonal structure phase appeared with increasing fields and coexisted with the orthorhombic one. 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.

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DO - 10.1143/jjap.42.l918

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AN - SCOPUS:0141763571

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SP - L918-L920

JO - Japanese Journal of Applied Physics, Part 2: Letters

JF - Japanese Journal of Applied Physics, Part 2: Letters

IS - 8 A

ER -

Field induced structural transformation in MnAs

Abstract

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