Volume 57, Number 1, January 2002
|Page(s)||14 - 19|
|Published online||01 September 2002|
Uniaxial relaxor ferroelectrics: The ferroic random-field Ising model materialized at last
Laboratorium für Angewandte Physik,
Gerhard-Mercator-Universität Duisburg, D-47048 Duisburg,
2 Jozef Stefan Institute - P.O. Box 3000, 1001 Ljubljana, Slovenia
3 Fachbereich Physik, Universität Osnabrück - D-46069, Osnabrück, Germany
Accepted: 22 October 2001
Owing to their intrinsic charge disorder ferroelectric crystals of strontium-barium-niobate doped with materialize the three-dimensional ferroic random-field Ising model (RFIM) as evidenced by order paramenter and susceptibility criticalities with NMR and dielectric spectroscopy, respectively. Upon cooling towards , extreme critical slowing-down due to activated dynamic scaling gives rise to relaxor-like dispersion of the susceptibility and to a metastable ferroelectric nanodomain state with fractal size distribution as imaged by piezoelectric force microscopy.
PACS: 05.70.Jk – Critical point phenomena / 77.80.Dj – Domain structure; hysteresis
© EDP Sciences, 2002
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