Local Ferroelectricity in SrTiO_3 Thin Films

Details Local Ferroelectricity in SrTiO_3 Thin Films Local Ferroelectricity in SrTiO_3 Thin Films

2002-08-31

arxiv.org/abs/cond-mat/0209011v1

Physics

Condensed Matter

Materials Science

8 pages, 3 figures, accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.89.147601

The temperature-dependent polarization of SrTiO_3 thin films is investigated using confocal scanning optical microscopy. A homogeneous out-of-plane and inhomogeneous in-plane ferroelectric phase are identified from images of the linear electrooptic response. Both hysteretic and non-hysteretic behavior are observed under a dc bias field. Unlike classical transitions in bulk ferroelectrics, local ferroelectricity is observed at temperatures far above the dielectric permittivity maximum. The results demonstrate the utility of local probe experiments in understanding inhomogeneous ferroelectrics.

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