[en] Epitaxial CaMnO3 films grown with 2.3% tensile strain on (001)-oriented LaAlO3 substrates are found to be incipiently ferroelectric below 25 K. Optical second harmonic generation (SHG) was used for the detection of the incipient polarization. The SHG analysis reveals that CaMnO3 crystallites with in-plane orientation of the orthorhombic b axis contribute to an electric polarization oriented along the orthorhombic a (respectively c) axis in agreement with the predictions from density functional calculations.
Disciplines :
Physics
Author, co-author :
Günter, T.
Bousquet, Eric ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
David, A.
Boullay, Ph.
Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Prellier, W.
Fiebig, M.
Language :
English
Title :
Incipient ferroelectricity in 2.3% tensile-strained CaMnO3 films
Publication date :
2012
Journal title :
Physical Review. B, Condensed Matter and Materials Physics
ISSN :
1098-0121
eISSN :
1550-235X
Publisher :
American Physical Society, Woodbury, United States - New York
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