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ID 43720
file
creator
Okuyama, Daisuke
Mouri, Takuya
Murakami, Youichi
subject
DyB4
successive magnetic transitions
component ordering
geometrical frustration
NDC
Physics
abstract
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.
description
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.
journal title
Journal of the Physical Society of Japan
volume
Volume 80
issue
Issue 7
start page
074701-1
end page
074701-9
date of issued
2011
publisher
The Physical Society of Japan
一般社団法人日本物理学会
issn
0031-9015
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
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。
relation url
department
Graduate School of Advanced Sciences of Matter