Mode coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3

S Wakimoto; C Stock; ZG Ye; W Chen; PM Gehring; G Shirane

doi:10.1103/PhysRevB.66.224102

Mode coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3

S Wakimoto^*, C Stock, ZG Ye, W Chen, PM Gehring, G Shirane

^*Corresponding author for this work

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

We present a quantitative analysis of the phonon line shapes obtained by neutron inelastic scattering methods in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3 (PMN). Differences in the shapes and apparent positions of the transverse acoustic- (TA) and transverse optic- (TO) phonon peaks measured in the (300) and (200) Brillouin zones at 690 K are well described by a simple model that couples the TA and soft TO modes in which the primary parameter is the wave vector and temperature-dependent TO linewidth Gamma(q,T). This mode-coupling picture provides a natural explanation for the uniform displacements of the polar nanoregions (PNR's), discovered by Hirota as the PNR result from the condensation of a soft TO mode that also contains a large acoustic component.

Original language	English
Article number	224102
Number of pages	8
Journal	Physical review B
Volume	66
Issue number	22
DOIs	https://doi.org/10.1103/PhysRevB.66.224102
Publication status	Published - 1 Dec 2002

Keywords / Materials (for Non-textual outputs)

NEUTRON-SCATTERING
PBMG1/3NB2/3O3
ANOMALIES
BEHAVIOR

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10.1103/PhysRevB.66.224102

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title = "Mode coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3",

abstract = "We present a quantitative analysis of the phonon line shapes obtained by neutron inelastic scattering methods in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3 (PMN). Differences in the shapes and apparent positions of the transverse acoustic- (TA) and transverse optic- (TO) phonon peaks measured in the (300) and (200) Brillouin zones at 690 K are well described by a simple model that couples the TA and soft TO modes in which the primary parameter is the wave vector and temperature-dependent TO linewidth Gamma(q,T). This mode-coupling picture provides a natural explanation for the uniform displacements of the polar nanoregions (PNR's), discovered by Hirota as the PNR result from the condensation of a soft TO mode that also contains a large acoustic component.",

keywords = "NEUTRON-SCATTERING, PBMG1/3NB2/3O3, ANOMALIES, BEHAVIOR",

author = "S Wakimoto and C Stock and ZG Ye and W Chen and PM Gehring and G Shirane",

year = "2002",

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doi = "10.1103/PhysRevB.66.224102",

language = "English",

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publisher = "American Physical Society",

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TY - JOUR

T1 - Mode coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3

AU - Wakimoto, S

AU - Stock, C

AU - Ye, ZG

AU - Chen, W

AU - Gehring, PM

AU - Shirane, G

PY - 2002/12/1

Y1 - 2002/12/1

N2 - We present a quantitative analysis of the phonon line shapes obtained by neutron inelastic scattering methods in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3 (PMN). Differences in the shapes and apparent positions of the transverse acoustic- (TA) and transverse optic- (TO) phonon peaks measured in the (300) and (200) Brillouin zones at 690 K are well described by a simple model that couples the TA and soft TO modes in which the primary parameter is the wave vector and temperature-dependent TO linewidth Gamma(q,T). This mode-coupling picture provides a natural explanation for the uniform displacements of the polar nanoregions (PNR's), discovered by Hirota as the PNR result from the condensation of a soft TO mode that also contains a large acoustic component.

AB - We present a quantitative analysis of the phonon line shapes obtained by neutron inelastic scattering methods in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3 (PMN). Differences in the shapes and apparent positions of the transverse acoustic- (TA) and transverse optic- (TO) phonon peaks measured in the (300) and (200) Brillouin zones at 690 K are well described by a simple model that couples the TA and soft TO modes in which the primary parameter is the wave vector and temperature-dependent TO linewidth Gamma(q,T). This mode-coupling picture provides a natural explanation for the uniform displacements of the polar nanoregions (PNR's), discovered by Hirota as the PNR result from the condensation of a soft TO mode that also contains a large acoustic component.

KW - NEUTRON-SCATTERING

KW - PBMG1/3NB2/3O3

KW - ANOMALIES

KW - BEHAVIOR

U2 - 10.1103/PhysRevB.66.224102

DO - 10.1103/PhysRevB.66.224102

M3 - Article

SN - 1098-0121

VL - 66

JO - Physical review B

JF - Physical review B

IS - 22

M1 - 224102

ER -

Mode coupling and polar nanoregions in the relaxor ferroelectric Pb(Mg1/3Nb2/3)O-3

Abstract

Keywords / Materials (for Non-textual outputs)

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