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

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

Research output: Contribution to journalArticle

18 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)37-40
Number of pages4
Journaljournal of the physical society of japan
Volume70
Issue number1
DOIs
Publication statusPublished - 2001 Jan 1
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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