Magnetic structure of β-MnO2: X-ray magnetic scattering study

Hirohiko Sato; Koji Wakiya; Toshiaki Enoki; Takashi Kiyama; Yusuke Wakabayashi; Hironori Nakao; Youichi Murakami

doi:10.1143/JPSJ.70.37

Magnetic structure of β-MnO₂: X-ray magnetic scattering study

Hirohiko Sato, Koji Wakiya, Toshiaki Enoki, Takashi Kiyama, Yusuke Wakabayashi, Hironori Nakao, Youichi Murakami

SCI - Physics

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

22 Citations (Scopus)

Abstract

An X-ray scattering experiment using synchrotron radiation has been performed on rutile-type β-MnO₂ single crystal. Below T_N, satellites due to magnetic scattering appear, which provides direct evidence of a helical magnetic structure. The wave number of the magnetic helix is approximately 0.297c*, incommensurate to the lattice and shows very weak temperature dependence. The extinction rule of the satellites is consistent with the magnetic structure proposed by Yoshimori [J. Phys. Soc. Jpn. 14 (1959) 807] in which the nearest helix chains are coupled in an antiferromagnetic way. The temperature dependence of the scattering intensity indicates that the critical exponent β is anomalously small for an ordinary three dimensional antiferromagnet; this strongly suggests a large chiral degeneracy effect of helical magnetism.

Original language	English
Pages (from-to)	37-40
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	70
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.70.37
Publication status	Published - 2001 Jan

Keywords

Critical phenomena
Helical magnet
Manganese oxides
Phase transition
Synchrotron radiation
X-ray magnetic scattering

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10.1143/JPSJ.70.37

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title = "Magnetic structure of β-MnO2: X-ray magnetic scattering study",

abstract = "An X-ray scattering experiment using synchrotron radiation has been performed on rutile-type β-MnO2 single crystal. Below TN, satellites due to magnetic scattering appear, which provides direct evidence of a helical magnetic structure. The wave number of the magnetic helix is approximately 0.297c*, incommensurate to the lattice and shows very weak temperature dependence. The extinction rule of the satellites is consistent with the magnetic structure proposed by Yoshimori [J. Phys. Soc. Jpn. 14 (1959) 807] in which the nearest helix chains are coupled in an antiferromagnetic way. The temperature dependence of the scattering intensity indicates that the critical exponent β is anomalously small for an ordinary three dimensional antiferromagnet; this strongly suggests a large chiral degeneracy effect of helical magnetism.",

keywords = "Critical phenomena, Helical magnet, Manganese oxides, Phase transition, Synchrotron radiation, X-ray magnetic scattering",

author = "Hirohiko Sato and Koji Wakiya and Toshiaki Enoki and Takashi Kiyama and Yusuke Wakabayashi and Hironori Nakao and Youichi Murakami",

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T1 - Magnetic structure of β-MnO2

T2 - X-ray magnetic scattering study

AU - Sato, Hirohiko

AU - Wakiya, Koji

AU - Enoki, Toshiaki

AU - Kiyama, Takashi

AU - Wakabayashi, Yusuke

AU - Nakao, Hironori

AU - Murakami, Youichi

PY - 2001/1

Y1 - 2001/1

N2 - An X-ray scattering experiment using synchrotron radiation has been performed on rutile-type β-MnO2 single crystal. Below TN, satellites due to magnetic scattering appear, which provides direct evidence of a helical magnetic structure. The wave number of the magnetic helix is approximately 0.297c*, incommensurate to the lattice and shows very weak temperature dependence. The extinction rule of the satellites is consistent with the magnetic structure proposed by Yoshimori [J. Phys. Soc. Jpn. 14 (1959) 807] in which the nearest helix chains are coupled in an antiferromagnetic way. The temperature dependence of the scattering intensity indicates that the critical exponent β is anomalously small for an ordinary three dimensional antiferromagnet; this strongly suggests a large chiral degeneracy effect of helical magnetism.

AB - An X-ray scattering experiment using synchrotron radiation has been performed on rutile-type β-MnO2 single crystal. Below TN, satellites due to magnetic scattering appear, which provides direct evidence of a helical magnetic structure. The wave number of the magnetic helix is approximately 0.297c*, incommensurate to the lattice and shows very weak temperature dependence. The extinction rule of the satellites is consistent with the magnetic structure proposed by Yoshimori [J. Phys. Soc. Jpn. 14 (1959) 807] in which the nearest helix chains are coupled in an antiferromagnetic way. The temperature dependence of the scattering intensity indicates that the critical exponent β is anomalously small for an ordinary three dimensional antiferromagnet; this strongly suggests a large chiral degeneracy effect of helical magnetism.

KW - Critical phenomena

KW - Helical magnet

KW - Manganese oxides

KW - Phase transition

KW - Synchrotron radiation

KW - X-ray magnetic scattering

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Magnetic structure of β-MnO₂: X-ray magnetic scattering study

Abstract

Keywords

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