J. Lee, S. A. Trugman, C. D. Batista, C. L. Zhang, D. Talbayev, X. S. Xu, S. --W. Cheong, D. A. Yarotski, A. J. Taylor, R. P. Prasankumar
Ferroelectric and ferromagnetic materials possess spontaneous electric (magnetic) order, which can be switched hysterically by applied electric (magnetic) fields respectively. Multiferroic materials, in which the above two properties are combined into single material have been intensively studied in recent years, both for their fundamental scientific interest as well as various potential applications in a broad range of magnetoelectric and magneto-optical devices [17, 18, 19, 20]. Microscopic origins of the magnetism (partially d or f shells) and ferroelectricity (empty d- shell, lone pair, charge ordering, etc) are quite opposite and the mechanism of strong coupling between them are actually quite puzzling and poorly understood. Hence, development of the descriptive and, importantly, predictive theory of these materials hold the key to their 'rational' design. Here we use ultrafast optical spectroscopy to show that quantum charge fluctuations can govern the interplay between electric polarization and magnetic ordering in the charge-ordered multiferroic LuFe2O4.
View original:
http://arxiv.org/abs/1205.3528
No comments:
Post a Comment