Show simple item record

dc.contributor.authorSkjærvø, Sandra Helen
dc.contributor.authorMeier, Quintin Noel
dc.contributor.authorFeygenson, Mikhail
dc.contributor.authorSpaldin, Nicola A.
dc.contributor.authorBillinge, Simon J. L.
dc.contributor.authorBožin, Emil S.
dc.contributor.authorSelbach, Sverre Magnus
dc.description.abstractThe improper ferroelectricity in YMnO3 and other related multiferroic hexagonal manganites is known to cause topologically protected ferroelectric domains that give rise to rich and diverse physical phenomena. The local structure and structural coherence across the ferroelectric transition, however, were previously not well understood. Here, we reveal the evolution of the local structure with temperature in YMnO3 using neutron total scattering techniques, and we interpret them with the help of first-principles calculations and with a first-principles-based effective Hamiltonian. The results show that, at room temperature, the local and average structures are consistent with the established ferroelectric P63cm symmetry. On heating, both local and average structural analyses show striking anomalies from about 800 K up to the Curie temperature and signatures of a locally more preserved structure than on average, consistent with increasing fluctuations of the order-parameter angle. These fluctuations result in an unusual local symmetry lowering into a continuum of structures on heating. This local symmetry breaking persists into the high-symmetry nonpolar phase, constituting an unconventional type of order-disorder transition, and we pinpoint it as the reason for the anomalous behavior near the phase transition. The hidden disorder revealed in YMnO3 by total scattering is expected to find analogies in other materials with structural frustration or characteristic energy barriers of different magnitudes.nb_NO
dc.publisherAmerican Physical Societynb_NO
dc.rightsNavngivelse 4.0 Internasjonal*
dc.titleUnconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganitesnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalPhysical Review Xnb_NO
dc.relation.projectNorges forskningsråd: 231430nb_NO
dc.description.localcodePublished by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.nb_NO
cristin.unitnameInstitutt for materialteknologi

Files in this item


This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal