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ID 43720
本文ファイル
著者
Matsumura, Takeshi 大学院先端物質科学研究科 広大研究者総覧
Okuyama, Daisuke
Mouri, Takuya
Murakami, Youichi
キーワード
DyB4
successive magnetic transitions
component ordering
geometrical frustration
NDC
物理学
抄録(英)
The successive magnetic phase transitions in DyB4 have been studied in detail by microscopic measurements using resonant X-ray diffraction and neutron scattering. It is shown that the ab-plane component of the magnetic moment is short-range-ordered in the intermediate phase where the c-axis component is long-range-ordered. It is estimated that this short-range order is dynamically fluctuating with a time scale between ~ 10−8 to ~ 10−11s. Crystal field excitation has also been investigated by inelastic neutron scattering. To qualitatively understand the phase-transition phenomenon, we have studied a simple two-sublattice model with an antiferromagnetic interaction by mean-field calculation. The calculation, though without a quadrupolar interaction, successfully explains the occurrence of double phase transition, magnetic specific heat and entropy, magnetic susceptibility, and the huge elastic softening in the intermediate phase. The general success of the mean-field calculation, except for the shortrange order, suggests that there is little effect of geometrical frustration on the macroscopic properties at zero magnetic field.
内容記述
This work was supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) and also by the 21st century COE program of Tohoku University.
掲載誌名
Journal of the Physical Society of Japan
80巻
7号
開始ページ
074701-1
終了ページ
074701-9
出版年月日
2011
出版者
The Physical Society of Japan
一般社団法人日本物理学会
ISSN
0031-9015
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2011 The Physical Society of Japan
Copyright (c) 2011 一般社団法人日本物理学会
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
関連情報URL
部局名
先端物質科学研究科