Phonon coupling to dynamic short-range polar order in a relaxor ferroelectric near the morphotropic phase boundary

Schneeloch, John A.; Xu, Zhijun; Winn, B.; Stock, C.; Gehring, P. M.; Birgeneau, R. J.; Xu, Guangyong

doi:10.1103/PhysRevB.92.214302

Title: Phonon coupling to dynamic short-range polar order in a relaxor ferroelectric near the morphotropic phase boundary

Journal Article · Mon Dec 28 00:00:00 EST 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.214302· OSTI ID:1240704

Schneeloch, John A. ^[1]; Xu, Zhijun ^[2];

^[3]; Stock, C. ^[4]; Gehring, P. M. ^[5]; Birgeneau, R. J. ^[2]; Xu, Guangyong ^[6]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., Stony Brook, NY (United States). Dept. of Physics and Astronomy
Univ. of California, Berkeley, CA (United States). Physics Dept.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Univ. of Edinburgh, Edinburgh (United Kingdom). School of Physics and Astronomy
National Institute of Standards and Technology, Gaithersburg, MD (United States). NIST Center for Neutron Research
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

We report neutron inelastic scattering experiments on single-crystal PbMg1/3Nb2/3O3 doped with 32% PbTiO3, a relaxor ferroelectric that lies close to the morphotropic phase boundary. When cooled under an electric field E∥ [001] into tetragonal and monoclinic phases, the scattering cross section from transverse acoustic (TA) phonons polarized parallel to E weakens and shifts to higher energy relative to that under zero-field-cooled conditions. Likewise, the scattering cross section from transverse optic (TO) phonons polarized parallel to E weakens for energy transfers 4≤ω≤9 meV. However, TA and TO phonons polarized perpendicular to E show no change. This anisotropic field response is similar to that of the diffuse scattering cross section, which, as previously reported, is suppressed when polarized parallel to E but not when polarized perpendicular to E. Our findings suggest that the lattice dynamics and dynamic short-range polar correlations that give rise to the diffuse scattering are coupled.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: SC00112704; AC02-05CH11231; AC05-00OR22725

OSTI ID:: 1240704

Alternate ID(s):: OSTI ID: 1234018; OSTI ID: 1393881; OSTI ID: 1456920

Report Number(s):: BNL-111868-2016-JA; PRBMDO; R&D Project: PO010; KC0201060

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 21; ISSN 1098-0121

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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