Phonon localization transition in relaxor ferroelectric PZN-5%PT

Manley, Michael E.; Christianson, Andrew D.; Abernathy, Douglas L.; Sahul, Raffi

doi:10.1063/1.4979465

Title: Phonon localization transition in relaxor ferroelectric PZN-5%PT

Journal Article · Mon Mar 27 00:00:00 EDT 2017 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4979465· OSTI ID:1351791

^[1]; Christianson, Andrew D. ^[1];

^[1];

^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Meggitt Sensing Systems, Irvine, CA (United States)

Relaxor ferroelectric behavior occurs in many disordered ferroelectric materials but is not well understood at the atomic level. Recent experiments and theoretical arguments indicate that Anderson localization of phonons instigates relaxor behavior by driving the formation of polar nanoregions (PNRs). Here, we use inelastic neutron scattering to observe phonon localization in relaxor ferroelectric PZN-5%PT (0.95[Pb(Zn_1/3 Nb_2/3)O₃]–0.05PbTiO₃) and detect additional features of the localization process. In the lead, up to phonon localization on cooling, the local resonant modes that drive phonon localization increase in number. The increase in resonant scattering centers is attributed to a known increase in the number of locally off centered Pb atoms on cooling. The transition to phonon localization occurs when these random scattering centers increase to a concentration where the Ioffe-Regel criterion is satisfied for localizing the phonon. Finally, we also model the effects of damped mode coupling on the observed phonons and phonon localization structure.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); 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:: 1351791

Alternate ID(s):: OSTI ID: 1361800

Journal Information:: Applied Physics Letters, Vol. 110, Issue 13; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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