Phys. Rev. B 69, 092105 (2004) [4 pages]Disorder and relaxation mode in the lattice dynamics of the PbMg1/3Nb2/3O3 relaxor ferroelectricReceived 27 August 2003; published 17 March 2004 The low-energy part of vibration spectrum in PbMg1/3Nb2/3O3 (PMN) relaxor ferroelectric was studied by inelastic neutron scattering. We observed the coexistence of a resolution-limited central peak with strong quasielastic scattering. The line width of the quasielastic component follows a Γ0+Dq2 dependence. We find that Γ0 is temperature dependent. The relaxation time follows the Arrhenius law well. The presence of a relaxation mode associated with quasielastic scattering in PMN indicates that order-disorder behavior plays an important rôle in the dynamics of diffuse phase transitions. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.69.092105
DOI:
10.1103/PhysRevB.69.092105
PACS:
77.80.-e, 61.12.-q, 63.50.+x, 64.60.-i
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