Giant negative electrostriction and dielectric tunability in a van der Waals layered ferroelectric

Files in This Item:
File Description SizeFormat 
PRM Neumayer 2019.pdf2.73 MBAdobe PDFDownload
Title: Giant negative electrostriction and dielectric tunability in a van der Waals layered ferroelectric
Authors: Neumayer, Sabine M.Eliseev, Eugene A.Susner, Michael A.Rodriguez, Brian al.
Permanent link:
Date: 1-Feb-2019
Online since: 2021-03-02T15:48:26Z
Abstract: The interest in ferroelectric van der Waals crystals arises from the potential to realize ultrathin ferroic systems owing to the reduced surface energy of these materials and the layered structure that allows for exfoliation. Here, we quantitatively unravel giant negative electrostriction of van der Waals layered copper indium thiophosphate (CIPS), which exhibits an electrostrictive coefficient Q33 as high as -3.2m4/C2 and a resulting bulk piezoelectric coefficient d33 up to -85 pm/V. As a result, the electromechanical response of CIPS is comparable in magnitude to established perovskite ferroelectrics despite possessing a much smaller spontaneous polarization of only a few μC/cm2. In the paraelectric state, readily accessible owing to low transition temperatures, CIPS exhibits large dielectric tunability, similar to widely used barium strontium titanate, and as a result both giant and continuously tunable electromechanical response. The persistence of electrostrictive and tunable responses in the paraelectric state indicates that even few-layer films or nanoparticles will sustain significant electromechanical functionality, offsetting the inevitable suppression of ferroelectric properties in the nanoscale limit. These findings can likely be extended to other ferroelectric transition metal thiophosphates and (quasi-) two-dimensional materials, and might facilitate the quest toward alternative ultrathin functional devices incorporating electromechanical response.
Funding Details: Science Foundation Ireland
Funding Details: U.S. Air Force Research Laboratory
U.S. National Research Council
Type of material: Journal Article
Publisher: American Physical Society
Journal: Physical Review Materials
Volume: 3
Issue: 2
Copyright (published version): 2019 American Physical Society
Keywords: FerroelectricityPiezoelectricity2-dimensional systems
DOI: 10.1103/PhysRevMaterials.3.024401
Language: en
Status of Item: Peer reviewed
ISSN: 2476-0455
This item is made available under a Creative Commons License:
Appears in Collections:Conway Institute Research Collection
Physics Research Collection

Show full item record

Page view(s)

Last Week
Last month
checked on Apr 11, 2021


checked on Apr 11, 2021

Google ScholarTM



If you are a publisher or author and have copyright concerns for any item, please email and the item will be withdrawn immediately. The author or person responsible for depositing the article will be contacted within one business day.