From phonons to domain walls, the central peak and critical slowing down

TL;DR

This paper explores the complex dynamical behaviors of perovskite oxides, including phonons, domain walls, and critical phenomena, revealing new functionalities and challenging previous simplified models.

Contribution

It provides a comprehensive analysis of perovskite oxides' dynamical properties, emphasizing the roles of anharmonicity and domain walls, which was not thoroughly addressed before.

Findings

Identification of complex dynamical behaviors in perovskites

Revelation of functionalities arising from domain walls

Challenging simplified models of perovskite dynamics

Abstract

We investigate perovskite oxides from different aspects, namely their pseudoharmonic dynamical properties, their dynamical properties when strong anharmonicity exists and the intriguing functionalities arising from domain walls. Taking these viewpoints together yields a rather complex picture of this material class which was not anticipated in previous approaches. It opens pathways to novel applications and reveals the rich ground states beyond the fictitious belief in simplicity of perovskites and such structures.