Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric

Manley, M. E.; Abernathy, D. L.; Sahul, R.; Stonaha, P. J.; Budai, J. D.

doi:10.1103/PhysRevB.94.104304

Title: Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric

Journal Article · Thu Sep 22 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.104304· OSTI ID:1326524

Manley, M. E. ^[1]; Abernathy, D. L. ^[1]; Sahul, R. ^[2]; Stonaha, P. J. ^[1]; Budai, J. D. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
TRS Technologies, State College, PA (United States)

A long-standing controversy for relaxor ferroelectrics has been the origin of the waterfall effect in the phonon dispersion curves, in which low-energy transverse phonons cascade into vertical columns. Originally interpreted as phonons interacting with polar nanoregions (PNRs), it was later explained as an interference effect of coupling damped optic and acoustic phonons. In light of a recently discovered PNR vibrational mode near the waterfall wavevector [M. E. Manley, J. W. Lynn, D. L. Abernathy, E. D. Specht, O. Delaire, A. R. Bishop, R. Sahul, and J. D. Budai, Nat. Commun. 5, 3683 (2014)] we have reexamined this feature using neutron scattering on [100]-poled PMN-30%PT (0.6Pb(Mg_1/3Nb_2/3)O₃ 0.3PbTiO₃). In addition, we find that the PNR mode couples to both optic and acoustic phonons, and that this results in complex patterns in the dynamic structure factor, including intensity pockets and peaks localized in momentum-energy space. These features are fully explained by extending the mode-coupling model to include three coupled damped harmonic oscillators representing the transverse optic, acoustic, and PNR modes.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1326524

Alternate ID(s):: OSTI ID: 1326121

Journal Information:: Physical Review B, Vol. 94, Issue 10; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 3 works

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