TY - JOUR
T1 - Electronic ferroelectricity from charge ordering in RFe2 O 4
AU - Ikeda, Naoshi
AU - Matsuo, Yoji
AU - Mori, Shigeo
AU - Yoshii, Kenji
N1 - Funding Information:
Manuscript received May 25, 2007; accepted January 3, 2008. This work was partially supported by the Ministry of Education, Science, Sports, and Culture of Japan. N. Ikeda is with the Department of Physics, Okayama University, Okayama, 700-8530, Japan (e-mail: ikedan@ science.okayama-u.ac.jp). Y. Matsuo and S. Mori are with the Department of Physical Science, Osaka Prefecture University, Sakai, 599-8531, Japan. K. Yoshii is with the Synchrotron Radiation Research Center, SPring-8, Japan Atomic Energy Research Agency, Mikazuki, Hyogo 679-5148, Japan. Digital Object Identifier 10.1109/TUFFC.2008.753
PY - 2008/5
Y1 - 2008/5
N2 - We report our recent discovery of novel ferroelectricity arising from the polar ordering of Fe3+ and Fe2+ in a mixed valence triangular lattice oxide LuFe2O4, where the electric polarization is not a result of ionic displacement. The polar ordering of Fe3+ and Fe2+ was confirmed with a resonant x-ray scattering study in SPring-8. The origin of such ordering is the competitive interaction between Fe3+ and Fe2+ in the triangular lattice, i.e., the charge frustration. The polar superlattice of Fe3+ and Fe2+ develops below 350 K, where the electric polarization appears. The ferroelectricity arising from the polar charge ordering or the polar electron distribution may have great potential for the future application of ferroelectrics.
AB - We report our recent discovery of novel ferroelectricity arising from the polar ordering of Fe3+ and Fe2+ in a mixed valence triangular lattice oxide LuFe2O4, where the electric polarization is not a result of ionic displacement. The polar ordering of Fe3+ and Fe2+ was confirmed with a resonant x-ray scattering study in SPring-8. The origin of such ordering is the competitive interaction between Fe3+ and Fe2+ in the triangular lattice, i.e., the charge frustration. The polar superlattice of Fe3+ and Fe2+ develops below 350 K, where the electric polarization appears. The ferroelectricity arising from the polar charge ordering or the polar electron distribution may have great potential for the future application of ferroelectrics.
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U2 - 10.1109/TUFFC.2008.753
DO - 10.1109/TUFFC.2008.753
M3 - Article
C2 - 18519209
AN - SCOPUS:44249125738
SN - 0885-3010
VL - 55
SP - 1043
EP - 1045
JO - Transactions of the IRE Professional Group on Ultrasonic Engineering
JF - Transactions of the IRE Professional Group on Ultrasonic Engineering
IS - 5
M1 - 4524981
ER -