From first- To second-order phase transitions in hybrid improper ferroelectrics through entropy stabilization

Fernando Pomiro, Chris Ablitt, Nicholas C. Bristowe, Arash A. Mostofi, Choongjae Won, Sang Wook Cheong, Mark S. Senn

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Hybrid improper ferroelectrics (HIFs) have been studied intensively over the past few years to gain an understanding of their temperature-induced phase transitions and ferroelectric switching pathways. Here we report a switching from a first- to a second-order phase transition pathway for HIFs Ca3-xSrxTi2O7, which is driven by the differing entropies of the phases that we identify as being associated with the dynamic motion of octahedral tilts and rotations. A greater understanding of the transition pathways in this class of layered perovskites, which host many physical properties that are coupled to specific symmetries and octahedral rotation and tilt distortions - such as superconductivity, negative thermal expansion, fast ion conductivity, ferroelectricity, among others - is a crucial step in creating novel functional materials by design.

Original languageEnglish (US)
Article number014101
JournalPhysical Review B
Volume102
Issue number1
DOIs
StatePublished - Jul 1 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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