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Doping Effect on the Charge Ordering in LuFe2O4

Published online by Cambridge University Press:  26 February 2011

Yoji Matsuo ,
Satoshi Shinohara ,
Shigeo Mori ,
Yoichi Horibe ,
Kenji Yoshii  and
Naoshi Ikeda
Yoji Matsuo
Affiliation:
smori@p.s.osakafu-u.ac.jp, Osaka Prefecture University, Department of Physics, 1-1 Gakuen-cho, Sakai, Osaka, 599-8531, Japan, 81-72-254-9712, 81-72-254-9712
Satoshi Shinohara
Affiliation:
s_kukku3@p.s.osakafu-u.ac.jp, Osaka Prefecture University, Department of Physics, 1-1 Gakuen-cho, Sakai, Osaka, 599-8531, Japan
Shigeo Mori
Affiliation:
smori@p.s.osakafu-u.ac.jp, Osaka Prefecture University, Department of Physics, 1-1 Gakuen-cho, Sakai, Osaka, 599-8531, Japan
Yoichi Horibe
Affiliation:
horibe@physics.rutgers.edu, Rutgers University, Dept. of Physics & Astronomy, Piscataway, NJ, 08854, United States
Kenji Yoshii
Affiliation:
yoshiike@spring8.or.jp, JAERI, Mikazuki, Hyougo, 679-5148, Japan
Naoshi Ikeda
Affiliation:
ikedan@psun.phys.okayama-u.ac.jp, Okayama University, Department of Physics, Okayama, 700-8530, Japan
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Abstract

Change of the charge ordered (CO) structure by substituting Cu2+ for Fe2+ in LuFe2O4 was investigated by means of the transmission electron microscopy. The CO structure in LuFe2O4 is characterized by the modulated structure with the wave vector of q=1/3[1-13/2] and the average size of the CO domains can be estimated to be about 10-20nm. On the contrary, the Cu2+ substitution in LuFe2O4 destroyed the CO structure drastically and induced characteristic local lattice distortion, which gives rise to characteristic diffuse scattering in the reciprocal space. High-resolution lattice images revealed that there exist nano-scale clusters, which are characterized as the short-range ordering of the Fe3+ and Cu2+ ions on the triangular lattice. In addition, the magnetic measurement revealed that LuFeCuO4 exhibits an antiferromagnetic transition around 50K, which is lower than the Neel temperature of 250K in LuFe2O4.

Keywords

ferroelectricitytransmission electron microscopy (TEM)Fe
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 966: Symposium T – Ferroelectrics and Multiferroics , 2006 , 0966-T03-04
Copyright
Copyright © Materials Research Society 2007

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References

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