Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 22, Issue 23, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/22/23/235903
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Below its ordering temperature at 105 K, perovskite-type SrTiO3 exhibits a tetragonal phase with three different structural domains that are strongly influenced by the application of uniaxial mechanical stresses and electric fields. A careful neutron diffraction study of superlattice reflections provides full quantitative information about the varying domain distributions under external loads as a function of temperature. It is shown that electric field and uniaxial stress exhibit competitive effects and the simultaneous application leads to a complex redistribution behaviour of the tetragonal domains. The results are discussed in the context of the formation of a field induced ferroelectric phase at low temperatures. The experimental findings demonstrate that its polarization is always perpendicular to the tetragonal axis and the polar phase has orthorhombic symmetry.
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