Conroy, Michele; Småbråten, Didrik René; Ophus, Colin; Shapovalov, Konstantin; Ramasse, Quentin M; Hunnestad, Kasper Aas; Selbach, Sverre M; Aschauer, Ulrich; Moore, Kalani; Gregg, J Marty; Bangert, Ursel; Stengel, Massimiliano; Gruverman, Alexei; Meier, Dennis (2024). Observation of Antiferroelectric Domain Walls in a Uniaxial Hyperferroelectric. Advanced materials, 36(39), e2405150. Wiley 10.1002/adma.202405150
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Advanced_Materials_-_2024_-_Conroy_-_Observation_of_Antiferroelectric_Domain_Walls_in_a_Uniaxial_Hyperferroelectric.pdf - Published Version Available under License Creative Commons: Attribution (CC-BY). Download (11MB) | Preview |
Ferroelectric domain walls are a rich source of emergent electronic properties and unusual polar order. Recent studies show that the configuration of ferroelectric walls can go well beyond the conventional Ising-type structure. Néel-, Bloch-, and vortex-like polar patterns have been observed, displaying strong similarities with the spin textures at magnetic domain walls. Here, the discovery of antiferroelectric domain walls in the uniaxial ferroelectric Pb5Ge3O11 is reported. Highly mobile domain walls with an alternating displacement of Pb atoms are resolved, resulting in a cyclic 180° flip of dipole direction within the wall. Density functional theory calculations show that Pb5Ge3O11 is hyperferroelectric, allowing the system to overcome the depolarization fields that usually suppress the antiparallel ordering of dipoles along the longitudinal direction. Interestingly, the antiferroelectric walls observed under the electron beam are energetically more costly than basic head-to-head or tail-to-tail walls. The results suggest a new type of excited domain-wall state, expanding previous studies on ferroelectric domain walls into the realm of antiferroic phenomena.
Item Type: |
Journal Article (Original Article) |
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Division/Institute: |
08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Smaabraten, Didrik René, Aschauer, Ulrich Johannes |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry |
ISSN: |
1521-4095 |
Publisher: |
Wiley |
Language: |
English |
Submitter: |
Pubmed Import |
Date Deposited: |
09 Aug 2024 15:16 |
Last Modified: |
28 Sep 2024 00:15 |
Publisher DOI: |
10.1002/adma.202405150 |
PubMed ID: |
39118561 |
Uncontrolled Keywords: |
DFT calculations antiferroelectric domain wall scanning transmission electron microscopy |
BORIS DOI: |
10.48350/199610 |
URI: |
https://boris.unibe.ch/id/eprint/199610 |
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