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Phys. Rev. B 69, 092105 (2004) [4 pages]

Disorder and relaxation mode in the lattice dynamics of the PbMg1/3Nb2/3O3 relaxor ferroelectric

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S. N. Gvasaliya *
Laboratory for Neutron Scattering, ETHZ & Paul-Scherrer Institut, CH-5232 Villigen PSI, Switzerland

S. G. Lushnikov
Ioffe Physical Technical Institute, 26 Politekhnicheskaya, 194021 St. Petersburg, Russia

B. Roessli
Laboratory for Neutron Scattering, ETHZ & Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

Received 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

* On leave from Ioffe Physical Technical Institute, 26 Politekhnicheskaya, 194021 St. Petersburg, Russia.

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