title: Direct Observation of Magnetic-Ion Off-Centering-Induced Ferroelectricity in Multiferroic Manganite Pr(Sr0.1Ca0.9)2 Mn2O7.
abstract: Ferroelectricity in multiferroic Pr(Sr0.1 Ca0.9)2 Mn2 O7 is found to originate from the off-centering of Mn ions. This polar displacement is energetically stabilized by the cooperative interplay of lattice deformation induced by orbital ordering and oxygen octahedral tilting. This mechanism implies that magnetism and ferroelectricity arise from the same magnetic ions, providing direct evidence for the magnetic-ion off-centering-driven ferroelectricity.
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Chao
authors.initials: C
authors.lastname: Ma
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors.forename: Huaixin
authors.initials: H
authors.lastname: Yang
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors.forename: Huanfang
authors.initials: H
authors.lastname: Tian
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Shi
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
authors.forename: Jie
authors.initials: J
authors.lastname: Zeng
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
authors.forename: Jianqi
authors.initials: J
authors.lastname: Li
keywords: manganite; multiferroics; orbital ordering; structural distortions; transmission electron microscopy