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Transport Properties and Magnetism of β-MnO2

Published online by Cambridge University Press:  10 February 2011

H. Sato ,
T. Enoki ,
K. Wakiya ,
M. Isobe ,
Y. Ueda ,
T. Kiyama ,
Y. Wakabayashi ,
H. Nakao  and
Y. Murakami
H. Sato
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japanhirohiko@chem.titech.ac.jp
T. Enoki
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japanhirohiko@chem.titech.ac.jp
K. Wakiya
Affiliation:
Department of Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8551, Japanhirohiko@chem.titech.ac.jp
M. Isobe
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Minato-ku, Tokyo 106-8666, Japan
Y. Ueda
Affiliation:
Institute for Solid State Physics, the University of Tokyo, Minato-ku, Tokyo 106-8666, Japan
T. Kiyama
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
Y. Wakabayashi
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
H. Nakao
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
Y. Murakami
Affiliation:
Photon Factory (PF), Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
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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 TN. 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 TN suggesting that the magnetic ordering is accompanied by a lattice distortion.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 602: Symposium JJ – Magnetoresistive Oxides & Related Materials , 1999 , 17
Copyright
Copyright © Materials Research Society 2000

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