DocumentCode :
54638
Title :
Analysis of Orbital Hybridization in the Magnetoelectric {\\hbox {YMnO}}_{3} Crystal From First Principles Calculations
Author :
Lima, A.F. ; Lalic, M.V.
Author_Institution :
Dept. de Fis., Univ. Fed. de Sergipe, São Cristóvão, Brazil
Volume :
49
Issue :
8
fYear :
2013
fDate :
Aug. 2013
Firstpage :
4687
Lastpage :
4690
Abstract :
We performed first-principles band-structure calculations on multiferroic hexagonal YMnO3 to study the characteristics of Mn-O and Y-O chemical bonds in the vicinity of ferroelectric (FE)-paraelectric (PE) phase transition. Both the FE and the PE crystal structures were successfully reproduced and considered paramagnetic ones. Exchange-correlation effects between electrons were treated by the recently developed modified Becke-Johnson (mBJ) approach which enabled successful reproduction of experimental band gap in the FE phase and predicted a small band gap in the PE phase. Analysis of the resulting electronic structures in both phases indicates that Mn-O bonds do not suffer significant changes during the PE-FE phase transition, while the Y-O bonds become more covalent, with clear signs of hybridization between Y 4dz2 and the O pz orbitals.
Keywords :
ab initio calculations; bonds (chemical); crystal structure; electron correlations; energy gap; exchange interactions (electron); ferroelectric materials; ferroelectric transitions; magnetoelectric effects; multiferroics; paramagnetic materials; yttrium compounds; YMnO3; band gap; chemical bonds; crystal structure; electron exchange correlation effects; electronic structure; ferroelectric-paraelectric phase transition; first principle band structure calculation; magnetoelectric yttrium manganese oxide crystal; modified Becke-Johnson approach; multiferroic hexagonal crystal; orbital hybridization; paramagnetic materials; Compounds; Crystals; Electric potential; Ions; Iron; Magnetoelectric effects; Manganese; Density functional theory (DFT); electronic properties; manganites; multiferroics;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/TMAG.2013.2256112
Filename :
6566073
Link To Document :
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