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Phys. Rev. B 72, 134105 (2005) [6 pages]

Aging and slow dynamics in SrxBa1−xNb2O6

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Lambert K. Chao, Eugene V. Colla, and M. B. Weissman
Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801-3080, USA

Dwight D. Viehland
Department of Materials Science and Engineering, Virginia Tech, 201 Holden Hall (0237), Blacksburg, Virginia 24061, USA

Received 12 February 2005; revised 15 June 2005; published 10 October 2005

The uniaxial “relaxor” ferroelectric SrxBa1−xNb2O6 (SBN) is found to crossover from holelike to cumulative aging as it is cooled into the frozen relaxor regime. The cumulative aging contrasts sharply with the behavior of cubic relaxors, supporting ideas that the spin-glasslike aging in cubic relaxors is connected with polarization components orthogonal to the net ferropolarization. In the relaxor regime, small dc fields are found to suppress much of the dissipative response, similar to long-time aging. Pyroelectric currents are measured, along with limits on pyroelectric noise, allowing limits to be set on dynamically coherent domain sizes. Large nonlinear susceptibilities are found near the freezing transition.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevB.72.134105
DOI: 10.1103/PhysRevB.72.134105
PACS: 77.84.Dy, 77.80.Dj

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