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

Abstract

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.

Authors:

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)

Publication Date:: Thu Sep 22 00:00:00 EDT 2016

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

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1326524

Alternate Identifier(s):: OSTI ID: 1326121

Grant/Contract Number:: AC05-00OR22725

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 94; Journal Issue: 10; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Manley, M. E., Abernathy, D. L., Sahul, R., Stonaha, P. J., and Budai, J. D. Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevB.94.104304.

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                    Manley, M. E., Abernathy, D. L., Sahul, R., Stonaha, P. J., & Budai, J. D. Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric.  United States.  https://doi.org/10.1103/PhysRevB.94.104304

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                    Manley, M. E., Abernathy, D. L., Sahul, R., Stonaha, P. J., and Budai, J. D. Thu .  
"Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric".  United States.  https://doi.org/10.1103/PhysRevB.94.104304.  https://www.osti.gov/servlets/purl/1326524.

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@article{osti_1326524,

  title        = {Three-mode coupling interference patterns in the dynamic structure factor of a relaxor ferroelectric},

  author       = {Manley, M. E. and Abernathy, D. L. and Sahul, R. and Stonaha, P. J. and Budai, J. D.},

  abstractNote = {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(Mg1/3Nb2/3)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.},

  doi          = {10.1103/PhysRevB.94.104304},

  journal      = {Physical Review B},

  number       = 10,

  volume       = 94,

  place        = {United States},

  year         = {Thu Sep 22 00:00:00 EDT 2016},

  month        = {Thu Sep 22 00:00:00 EDT 2016}

}

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

Abstract

Citation Formats

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