Abstract:
:Polar van der Waals chalcogenophosphates exhibit unique properties, such as negative electrostriction and multi-well ferrielectricity, and enable combining dielectric and 2D electronic materials. Using low temperature piezoresponse force microscopy, we revealed coexistence of piezoelectric and non-piezoelectric phases in CuInP2Se6, forming unusual domain walls with enhanced piezoelectric response. From systematic imaging experiments we have inferred the formation of a partially polarized antiferroelectric state, with inclusions of structurally distinct ferrielectric domains enclosed by the corresponding phase boundaries. The assignment is strongly supported by optical spectroscopies and density-functional-theory calculations. Enhanced piezoresponse at the ferrielectric/antiferroelectric phase boundary and the ability to manipulate this entity with electric field on the nanoscale expand the existing phenomenology of functional domain walls. At the same time, phase-coexistence in chalcogenophosphates may lead to rational strategies for incorporation of ferroic functionality into van der Waals heterostructures, with stronger resilience toward detrimental size-effects.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Dziaugys A,Kelley K,Brehm JA,Tao L,Puretzky A,Feng T,O'Hara A,Neumayer S,Chyasnavichyus M,Eliseev EA,Banys J,Vysochanskii Y,Ye F,Chakoumakos BC,Susner MA,McGuire MA,Kalinin SV,Ganesh P,Balke N,Pantelides ST,Morozodoi
10.1038/s41467-020-17137-0subject
Has Abstractpub_date
2020-07-17 00:00:00pages
3623issue
1issn
2041-1723pii
10.1038/s41467-020-17137-0journal_volume
11pub_type
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