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Evolution of nanodomains in the uniaxial relaxor Sr0.61Ba0.39Nb2O6:Ce
Vladimir V Shvartsman1, Wolfgang Kleemann
1Angewandte Physik, Universität Duisburg-Essen, D-47048 Duisburg, Germany. vladimir@kleemann.uni-duisburg.de
Abstract:
The evolution of the nanodomain pattern of the uniaxial relaxor ferroelectric strontium barium niobate doped with cerium was studied by piezoresponse force microscopy (PFM). The fractal-like nanodomains observed at room temperature decay on heating. At temperatures up to about 15 K above the Curie temperature, Tc = 320 K, areas of correlated polarization are still visible. On cooling from the paraelectric state to below Tc, a slow isothermal growth of nanodomain was found. The mean domain size increases according to a logarithmic law as predicted for the three-dimensional random field Ising model.
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