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Momentum-resolved observations of the phonon instability driving geometric improper ferroelectricity in yttrium manganite.

dc.contributor.author Abernathy, Douglas L
dc.contributor.author Bansal, Dipanshu
dc.contributor.author Chi, Songxue
dc.contributor.author Delaire, Olivier
dc.contributor.author Garlea, V Ovidiu
dc.contributor.author Niedziela, Jennifer L
dc.contributor.author Ren, Yang
dc.contributor.author Sinclair, Ryan
dc.contributor.author Zhou, Haidong
dc.date.accessioned 2018-05-15T02:34:02Z
dc.date.available 2018-05-15T02:34:02Z
dc.date.issued 2018-01-02
dc.identifier.issn 2041-1723
dc.identifier.issn 2041-1723
dc.identifier.uri https://hdl.handle.net/10161/16712
dc.description.abstract Magnetoelectrics offer tantalizing opportunities for devices coupling ferroelectricity and magnetism but remain difficult to realize. Breakthrough strategies could circumvent the mutually exclusive origins of magnetism and ferroelectricity by exploiting the interaction of multiple phonon modes in geometric improper and hybrid improper ferroelectrics. Yet, the proposed instability of a zone-boundary phonon mode, driving the emergence of ferroelectricity via coupling to a polar mode, remains to be directly observed. Here, we provide previously missing evidence for this scenario in the archetypal improper ferroelectric, yttrium manganite, through comprehensive scattering measurements of the atomic structure and phonons, supported with first-principles simulations. Our experiments and theoretical modeling resolve the origin of the unusual temperature dependence of the polarization and rule out a reported double-step ferroelectric transition. These results emphasize the critical role of phonon anharmonicity in rationalizing lattice instabilities in improper ferroelectrics and show that including these effects in simulations could facilitate the design of magnetoelectrics.
dc.language eng
dc.relation.ispartof Nature communications
dc.relation.isversionof 10.1038/s41467-017-02309-2
dc.title Momentum-resolved observations of the phonon instability driving geometric improper ferroelectricity in yttrium manganite.
dc.type Journal article
dc.date.updated 2018-05-15T02:33:58Z
pubs.issue 1
pubs.organisational-group Pratt School of Engineering
pubs.organisational-group Duke
pubs.organisational-group Physics
pubs.organisational-group Trinity College of Arts & Sciences
pubs.organisational-group Mechanical Engineering and Materials Science
pubs.organisational-group Staff
pubs.publication-status Published
pubs.volume 9
duke.contributor.orcid Delaire, Olivier|0000-0003-1230-2834


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