Understanding and Revisiting Properties of EuTiO3 Bulk Material and Films from First Principles

作者：Yang Yurong^*; Ren Wei; Wang Dawei; Bellaiche L

来源：Physical Review Letters, 2012, 109(26): 267602.

DOI：10.1103/PhysRevLett.109.267602

Ab initio computations are performed to investigate properties of bulk material and epitaxial films made of EuTiO3 (ETO). A whole family of nanoscale twinned phases, that present complex oxygen octahedra tilting (OOT) and unusual antiferroelectricity, is found to be degenerate in energy with simpler phases (all possessing typical OOT) in bulk ETO. Such degeneracy provides a successful explanation of recently observed anomalous phenomena. The calculations also lead to revisiting the (rich) phase diagram of ETO films. DOI: 10.1103/PhysRevLett.109.267602

• 单位
  上海大学; 西安交通大学