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Transport Properties and Magnetism of β-MnO2

  • H. Sato (a1), T. Enoki (a1), K. Wakiya (a1), M. Isobe (a2), Y. Ueda (a2), T. Kiyama (a3), Y. Wakabayashi (a3) (a4), H. Nakao (a3) and Y. Murakami (a3)...

Abstract

A comprehensive study of transport properties and magnetism on β-MnO2 reveals the strong coupling between the conduction electrons and the localized spins which are supposed to form a magnetic helix below TN ∼ 92 K. We also show the direct evidences of the helical magnetism by means of the measurements of the anisotropy in the magnetic susceptibility and the observation of x ray magnetic scatterings on a single crystal of β-MnO2. These results are consistent with proper-type helix model proposed by Yoshimori [J. Phys. Soc. Jpn. 14, p. 807 (1959)]. This model also qualitatively agrees with the anisotropy in magnetoresistance that appears below T N. The pitch of the magnetic helix is not commensurate to the lattice and it is slightly temperature dependent. The intensity of several Bragg peaks drastically changes at T N suggesting that the magnetic ordering is accompanied by a lattice distortion.

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